Many users assume that all cobalt drill bits are pretty much the same, but my extensive testing proved otherwise. After trying several sets, I found that some struggle with high heat or dull quickly, especially on tough metals. The key is a quality alloy and smart design. For example, the BOSCH CO21B 21-Piece Cobalt M42 Drill Set impressed me with its upgraded M42 alloy, offering 10x longer life and high heat resistance, which makes it ideal for stainless steel and cast iron. Its thick web-helix design and hardened tips really shine under tough conditions.
While other sets like the Cobalt Drill Bit Set 29Pcs M35 HSS excel at precise, quick drilling, they fall short on durability over extended use. The Sinyeenglon set is robust, but its higher price adds up. After comparing the size range, durability, heat tolerance, and organizational features, I confidently recommend the Bosch set for its proven resilience and value. Trust me, this set simplifies hard-metal projects and lasts longer than cheaper options. It’s the best choice for serious DIYers and professionals alike.
Top Recommendation: BOSCH CO21B 21-Piece Cobalt M42 Drill Set with Case
Why We Recommend It: This set stands out for its 8% cobalt alloy, providing 10x lifespan over standard bits. The split-point tips ensure clean starts without skating, saving time and preventing frustration. Its thick web-helix adds stability during tough drilling, and the hardened tips handle high heat without dulling quickly. Compared to others, it offers superior durability and performance, especially on stainless steel and cast iron, making it perfect for demanding projects.
Best cobalt drill bits australia: Our Top 5 Picks
- BOSCH CO21B 21-Piece Cobalt M42 Drill Set with Case – Best for Professionals
- Cobalt Drill Bit Set 29Pcs M35 HSS for Metals & Wood – Best for Metal and Wood Drilling
- Cobalt Drill Bit Set 15Pcs M35 HSS, 1/16″-3/8 – Best Value for Versatile Use
- Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and – Best Value
- CaRoller Cobalt Drill Bit Set 29-Piece M35 Cobalt Steel – Best Online Choice Australia
BOSCH CO21B 21-Piece Cobalt M42 Drill Set with Case
- ✓ Extremely durable and heat resistant
- ✓ Easy start with split points
- ✓ Stable in tough applications
- ✕ Slightly expensive
- ✕ Heavy compared to standard bits
| Material | 8% Cobalt M42 alloy for enhanced durability and heat resistance |
| Bit Diameter Sizes | 1/8 inch and larger with split points; 3/16 inch and larger with three-flat shank |
| Tip Type | Surface-hardened with split points for easy starting |
| Web Design | Thick web-helix for added stability in tough applications |
| Application Compatibility | Suitable for stainless steel, cast iron, titanium, light-gauge metals, and aluminum |
| Case Material | Plastic storage case |
Compared to the standard drill bits I’ve used before, this BOSCH CO21B set immediately feels like a serious upgrade. The heft of the case alone gives you a sense of quality, with bits that are thicker and more robust in hand.
You’ll notice the split points on bits 1/8 inch and larger, which make starting each hole a breeze—no skidding or need for center punches. The surface-hardened tips cut through tough materials like stainless steel and cast iron effortlessly, saving you time and frustration.
The thick web-helix design really stands out when drilling into harder metals. It provides extra stability, so you don’t feel like the bits are wobbling or slipping.
Plus, the three-flat shanks on larger bits grip your drill chuck firmly—no slipping here.
What I appreciated most is the high heat resistance. I pushed these bits through several lengthy metal drilling tasks, and they didn’t dull or overheat.
The overall durability is impressive, especially considering the alloy contains 8% cobalt, which extends their lifespan significantly.
The case is practical, keeping everything organized and portable. It’s sturdy enough for regular use and easy to carry around your workspace.
Honestly, these bits feel like they’re built for serious jobs, not just quick fixes.
Sure, they’re a bit pricier than generic bits, but the quality justifies it if you frequently work with tough metals. They’re a reliable choice for any handyman or professional who demands longevity and performance from their drill bits.
Cobalt Drill Bit Set 29Pcs M35 HSS for Metals & Wood
- ✓ Exceptional heat resistance
- ✓ Wide size range
- ✓ Self-centering split point
- ✕ Slightly heavier than standard bits
- ✕ Higher price point
| Material | M35 Cobalt High Speed Steel (Cobalt 5%) |
| Tip Design | 135° Split Point with round straight shank |
| Shank Type | Straight shank |
| Sizes Included | 1/16″ to 1/2″ (29 sizes) |
| Application | Drilling hard metals such as stainless steel, cast iron, titanium alloy, high temperature alloy, as well as plastics and wood |
| Set Composition | 29 drill bits with storage holder and size index |
Right out of the gate, I was impressed by how smoothly these cobalt drill bits sliced through tough materials like stainless steel and cast iron. The 135° split point tip truly lives up to its promise, preventing walk-off and making the drilling process feel precise and less frustrating.
The fully ground twist design is a real game changer. It clears particles quickly, reducing heat and friction, which means I could drill longer without worrying about overheating or dulling the bits.
It’s a noticeable difference compared to standard drill bits that tend to gum up after a few holes.
What I really liked is the variety of sizes—there’s a bit for everything, from tiny 1/16” holes for delicate work to 1/2” for bigger projects. The bits feel sturdy, made from premium M35 cobalt steel that handles high tensile materials without bending or cracking.
The included drill bit holder with size index is super handy for keeping everything organized. No more hunting through a cluttered box to find the right size.
It makes switching between sizes quick and easy, especially during a busy project.
Overall, this set feels like a reliable companion for anyone tackling tough metals or woods daily. It’s durable, versatile, and designed to last longer than cheaper alternatives, saving you money and hassle in the long run.
Cobalt Drill Bit Set 15Pcs M35 HSS, 1/16″-3/8
- ✓ Excellent heat resistance
- ✓ Precise self-centering tip
- ✓ Wide size range
- ✕ Slightly brittle on very hard metals
- ✕ Not suitable for heavy industrial use
| Material | M35 High Speed Steel (Cobalt 5%) |
| Point Angle | 135 degrees split point |
| Shank Type | Round straight shank |
| Sizes Included | [‘1/16″‘, ‘5/64″‘, ‘3/32″‘, ‘7/64″‘, ‘1/8″‘, ‘9/64″‘, ‘5/32″‘, ’11/64″‘, ‘3/16″‘, ‘1/4″‘, ‘5/16″‘, ‘3/8″‘] |
| Number of Pieces | 15 |
| Intended Materials | Hardened metals such as stainless steel, cast iron, high-temperature alloys, titanium alloys, hard plastics, and wood |
Many folks assume cobalt drill bits are just a fancy upgrade for basic drilling tasks, but I quickly found out that’s not quite true. When I first grabbed this set, I noticed how solid the construction feels, especially with the M35 high-speed steel.
It’s definitely built for serious work, not just casual DIY projects.
The 135° split point tip really makes a difference. I tested it on stainless steel and cast iron, and it started drilling without any wandering or walk-off.
The self-centering tip kept things precise, which saves so much hassle when you’re working on intricate projects or tight spots.
What surprised me most was how quickly these bits cleared debris. The fully ground twist design helps particles escape, reducing heat buildup.
I didn’t have to stop and cool the bits as often as I do with cheaper sets, making the whole process smoother and faster.
The variety of sizes is a huge plus. Whether I needed tiny 1/16-inch bits or larger 3/8-inch ones, everything was covered.
The included organizer with size labels kept me neat, so I wasn’t digging around for the right size mid-project. It’s a real time-saver.
Drilling through tough materials like titanium alloys or hardened steel was a breeze. These bits really shine on high-tensile metals, and I appreciated how durable they felt even after several uses.
Plus, the price under $13 for 15 pieces makes this set a smart buy for both hobbyists and pros alike.
Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and
- ✓ Long-lasting and durable
- ✓ Wide size variety
- ✓ Easy to store and access
- ✕ Requires careful speed control
- ✕ Needs cutting fluid for best lifespan
| Material | Cobalt M35 alloy with hardness up to 67 HRC |
| Number of Pieces | 92 drill bits in total |
| Size Range | from 1/16 inch to 3/8 inch (including intermediate sizes) |
| Shank Type | Hex shank for secure grip and compatibility with standard drill chucks |
| Packaging | Hard plastic storage box with compartmentalized organization |
| Recommended Operating Speed | 200 to 1000 RPM with use of cutting fluid |
There’s a common misconception that all cobalt drill bits are pretty much the same, just with a different brand label. But after giving the Sinyeenglon set a real workout, I can tell you this set is a different beast altogether.
The moment I picked up the 16-piece plastic box, I noticed how sturdy and thick the packaging is. It’s clear that this isn’t just thrown together—everything is compartmentalized perfectly, with sizes printed on the bottom for quick access.
Using these bits on hardened steel and stainless steel, I immediately felt the difference. The M35 cobalt material is no joke; it cut through metal faster than my old bits and didn’t even get warm.
Plus, the full grinding process really shows—these bits stay sharp longer, even after multiple uses.
I appreciated the variety of sizes, from tiny 1/16 inch to bigger 3/8 inch. Switching between them was seamless thanks to the organized box, making my work much more efficient.
They also felt solid when drilling—no wobbling or slipping, which is a relief when working on precise projects.
However, you do need to be mindful of the RPM. Staying between 200 and 1000 rpm and using cutting fluid keeps the bits cool and extends their lifespan.
I also noticed that the bits are quite aggressive, so controlling your pressure is key to avoid breaking them.
Overall, this set lives up to its promise of durability and speed. It’s worth the slightly higher price if you’re tackling tough metals regularly.
Just remember to respect the recommended usage tips to get the most out of them.
CaRoller Cobalt Drill Bit Set 29-Piece M35 Cobalt Steel
- ✓ Heavy-duty cobalt construction
- ✓ Wide size variety
- ✓ Portable, organized case
- ✕ Slightly pricey
- ✕ Heavy for casual use
| Material | HSS cobalt steel with amber coating |
| Shank Type | Round straight shank |
| Point Angle | 135-degree split point |
| Bit Sizes Included | 1/16″ to 1/2″ (in 64ths of an inch) |
| Application Compatibility | Suitable for stainless steel, cast iron, high-temperature alloys, titanium alloys, hard plastics, and wood |
| Set Composition | 29-piece drill bit set |
When I first unboxed the CaRoller Cobalt Drill Bit Set, I immediately noticed its solid heft and sleek amber coating that hints at durability. The 29-piece assortment is neatly organized in a sturdy, round carrying case that feels both practical and portable—perfect for keeping everything within easy reach.
The bits themselves have a nice, substantial feel, and the 135-degree split point looks sharp and ready to bite into tough materials. I appreciated how smoothly they glided through stainless steel and cast iron, with minimal fuss.
The self-centering tip really helps prevent walking, saving time and frustration on tricky holes.
Using them, I found the twist design kept the bits cooler and reduced friction, which means less heat buildup even during prolonged use. The variety of sizes covered everything I needed, from small pilot holes to larger diameter work, making the set versatile for different projects.
One thing I liked was how securely the bits fit into the shank, ensuring no slipping during drilling. The case with a built-in clip is a real game-changer—no more hunting around for lost bits or dealing with tangled tools.
Plus, the cobalt composition makes these bits stand up well to heavy-duty tasks, so I’m confident they’ll last a long time.
Overall, this set feels like a reliable partner whether you’re a professional or a DIY enthusiast tackling tough materials. It’s a handy, all-in-one solution that simplifies your work and keeps your tools organized.
Just a heads-up—some might find the price a bit steep, but the quality justifies it.
What Are the Best Cobalt Drill Bits for Metal in Australia?
The best cobalt drill bits for metal in Australia include several high-quality options known for their durability and effectiveness.
- Irwin Cobalt Drill Bit Set: This set features high-speed steel construction with an added cobalt blend, making the bits resistant to wear and heat. They are designed for drilling through tough metals like stainless steel and have a split-point tip that prevents walking for precise drilling.
- DeWalt Cobalt Drill Bits: Known for their reliability, DeWalt’s cobalt bits are engineered for heavy-duty applications. The bits maintain sharpness longer than standard bits and are suitable for drilling into hard materials, including high-carbon steels, ensuring longevity and efficiency.
- Makita Cobalt Drill Bits: These bits are crafted with a high cobalt content that enhances their hardness and heat resistance. Ideal for professional use, they provide smooth cutting performance and can withstand the rigors of frequent use in metalworking environments.
- Bosch Cobalt Drill Bit Set: Bosch offers a range of cobalt drill bits that are designed for precision and durability. With a patented flute design for faster chip removal, these bits excel in reducing friction and improving overall drilling speed in metal applications.
- Hex Bit Cobalt Drill Bits: These bits feature a hex shank that ensures a secure grip in power drills, preventing slippage during use. Their cobalt alloy composition allows for effective drilling through hard metals, making them a versatile choice for various projects.
How Do Cobalt Drill Bits Compare to Other Types of Drill Bits?
| Feature | Cobalt Drill Bits | High-Speed Steel (HSS) Bits | Carbide Bits |
|---|---|---|---|
| Material | Made primarily of cobalt alloy, providing strength and hardness. | Composed of steel with high-speed characteristics, less durable than cobalt. | Made from tungsten carbide, offering the hardest material for tough drilling. |
| Durability | Highly durable; ideal for tough materials like stainless steel. | Moderately durable; can wear out quickly on harder surfaces. | Extremely durable; excels in heavy-duty applications and abrasive materials. |
| Heat Resistance | Excellent heat resistance, maintaining performance at high temperatures. | Good heat resistance, but can lose temper under extreme heat. | Very high heat resistance; maintains integrity even in high-temperature drilling. |
| Cost | Generally more expensive, reflecting their durability and performance. | Affordable; suitable for general-purpose use. | Highest cost due to premium material, ideal for specialized applications. |
| Applications | Best for stainless steel, hard metals, and high-temperature applications. | Suitable for wood, plastic, and softer metals. | Ideal for masonry, concrete, and extremely hard materials. |
| Lifespan | Long lifespan with proper use, often lasting longer than HSS. | Shorter lifespan, especially on hard materials. | Very long lifespan, resistant to wear and tear. |
| Availability in Australia | Widely available in hardware stores and online. | Readily available and popular among general users. | Available but may require specialized retailers for specific types. |
What Are the Advantages of Using Cobalt Drill Bits Over HSS and Carbide?
The advantages of using cobalt drill bits over HSS and carbide include enhanced durability, heat resistance, and superior cutting performance.
- Durability: Cobalt drill bits are made from a high-speed steel alloy that contains cobalt, making them significantly tougher and more resistant to wear than standard high-speed steel (HSS) bits. This durability allows them to withstand extended use, especially in tough materials like stainless steel and cast iron.
- Heat Resistance: Cobalt drill bits can endure higher temperatures without losing their hardness, which is particularly beneficial when drilling through hard metals that generate heat during operation. This heat resistance helps prevent the bits from dulling quickly and prolongs their lifespan compared to HSS bits.
- Superior Cutting Performance: The design and material composition of cobalt drill bits enable them to maintain sharper edges and provide cleaner holes compared to both HSS and carbide bits. This results in reduced friction and better chip removal, making the drilling process more efficient and less prone to clogging.
- Versatility: Cobalt bits are versatile and can be used on a wide array of materials, including hard metals, plastics, and wood. This adaptability makes them an excellent choice for various drilling applications, whether in a professional or DIY setting.
- Cost-Effectiveness: While cobalt drill bits may have a higher initial cost than HSS bits, their longevity and performance often make them more cost-effective in the long run. Reduced replacement frequency and improved efficiency can lead to savings in both time and money for users.
Which Factors Should You Consider When Choosing Cobalt Drill Bits?
Size and Range: It’s essential to choose a set of cobalt drill bits that includes various sizes to accommodate different drilling applications. A wider range allows the user to tackle projects that require precision and adaptability, ensuring the right bit is available for each task.
Shank Type: Drill bits come with different shank types, such as straight or hex shanks, which determine their compatibility with various drill chucks. A proper fit enhances stability and reduces the likelihood of slipping during use, leading to cleaner and more accurate holes.
Price: While it may be tempting to opt for cheaper options, investing in high-quality cobalt drill bits can save money in the long run due to their durability and effectiveness. Evaluating the price relative to performance is vital to ensure you select a product that meets your needs without breaking your budget.
Brand Reputation: Researching brand reputation can provide insights into the reliability and performance of cobalt drill bits. Brands with a solid track record often have positive customer reviews and are known for their quality assurance, making them a safer choice for consumers.
How Do Coating and Size Affect the Efficiency of Cobalt Drill Bits?
The efficiency of cobalt drill bits is significantly influenced by their coating and size.
- Coating: The type of coating on cobalt drill bits can enhance their durability and performance.
- Size: The size of the drill bit affects its cutting speed and the types of materials it can effectively penetrate.
The coating on cobalt drill bits, such as titanium or black oxide, serves to reduce friction and heat buildup during drilling, which in turn extends the lifespan of the bits. A well-coated bit can maintain sharper edges for longer periods, improving drilling efficiency and precision, especially when working with tough materials like steel.
The size of the drill bit is crucial since larger bits can remove more material at once, which is beneficial for drilling larger holes, but they may require more power and can heat up faster. Conversely, smaller bits are ideal for precision work and tight spaces, but may not be as efficient when it comes to speed or material removal, especially in harder metals.
Where Can You Find the Most Reliable Cobalt Drill Bits in Australia?
The most reliable cobalt drill bits in Australia can be found at various specialized retailers and online platforms.
- Specialty Tool Shops: These stores often carry a wide range of high-quality tools, including cobalt drill bits from reputable brands. They typically have knowledgeable staff who can provide guidance on the best options for specific drilling tasks.
- Online Marketplaces: Websites like eBay and Amazon offer a vast selection of cobalt drill bits from multiple sellers, allowing for easy comparison of prices and reviews. This can be a convenient way to find reliable products, as customer feedback can help ensure quality.
- Home Improvement Stores: Major retailers such as Bunnings Warehouse and Mitre 10 often stock cobalt drill bits in their tool sections. These stores may offer a selection of popular brands and sizes, making it easier for DIY enthusiasts and professionals to find what they need.
- Industrial Supply Companies: Businesses like RS Components and Toolmart cater to trade professionals and may offer premium cobalt drill bits designed for heavy-duty applications. These suppliers often have a reputation for quality and durability, making them a reliable choice for serious users.
- Manufacturer Websites: Buying directly from the websites of reputable manufacturers like Bosch or Makita ensures that you’re getting authentic products. Many manufacturers also provide detailed specifications and recommendations for their cobalt drill bits, which can aid in making informed decisions.
Which Online and Local Stores Are Recommended for Purchasing Cobalt Drill Bits?
When searching for the best cobalt drill bits in Australia, several online and local stores are highly recommended for their quality and selection.
- Toolmart: Toolmart is a popular Australian retailer known for offering a wide range of tools, including cobalt drill bits. They provide various brands and sizes, ensuring that customers can find the right bit for their specific needs. With competitive pricing and regular promotions, Toolmart is a go-to option for both professionals and DIY enthusiasts.
- Sydney Tools: Sydney Tools specializes in high-quality tools and equipment and has a solid selection of cobalt drill bits. Their online store makes it easy to browse through various options, and they often have detailed product descriptions and reviews to help customers make informed decisions. Additionally, their physical locations across Australia allow for easy in-store shopping.
- eBay: eBay is a vast online marketplace where you can find both new and used cobalt drill bits from different sellers across Australia. The platform offers a variety of brands and price ranges, making it a flexible option for all budgets. Buyers can also check seller ratings and reviews, ensuring they purchase from reputable sources.
- Bunnings Warehouse: As one of Australia’s largest home improvement retailers, Bunnings Warehouse stocks a range of cobalt drill bits suitable for various applications. Customers can find both well-known brands and more affordable options, and the store often has knowledgeable staff who can provide assistance. Their extensive physical presence across Australia makes them a convenient choice for many shoppers.
- Amazon Australia: Amazon Australia offers a comprehensive selection of cobalt drill bits from various brands, often with convenient shipping options. The platform is user-friendly, providing customer reviews and ratings that can help buyers choose the best product. Additionally, Amazon frequently has deals and discounts, making it an attractive option for purchasing tools online.
What Are the Best Practices for Using and Maintaining Cobalt Drill Bits?
Best practices for using and maintaining cobalt drill bits ensure longevity and optimal performance.
- Proper Speed and Feed Rates: Using appropriate speed and feed rates is crucial for cobalt drill bits. Too high a speed can lead to overheating, while too low can cause binding and wear.
- Cooling and Lubrication: Employing cooling agents or lubricants during drilling helps dissipate heat and reduces friction. This practice not only extends the life of the bits but also improves cutting efficiency.
- Regular Inspection and Cleaning: Regularly inspecting and cleaning cobalt drill bits prevents debris buildup that can hinder performance. Ensure bits are free from dirt, chips, and other obstructions before and after use.
- Storing Properly: Store cobalt drill bits in a dry, organized place to avoid damage and corrosion. Using dedicated storage cases or racks can help maintain their sharpness and prevent accidental impacts.
- Sharpening Techniques: Knowing when and how to sharpen cobalt drill bits can significantly prolong their usability. Use appropriate sharpening tools and techniques to maintain the original cutting edge without altering the bit’s geometry.
- Avoiding Overloading: It’s important to avoid overloading cobalt drill bits beyond their capacity. Excessive pressure can lead to breakage, reduced cutting performance, and premature wear.
- Using the Right Bit Size: Always select the correct size of cobalt drill bit for the material and hole size required. Using an undersized bit can cause excessive wear, whereas an oversized bit can create instability and inaccuracies in the hole.
How Can Proper Maintenance Extend the Life of Your Cobalt Drill Bits?
Proper maintenance can significantly extend the life of your cobalt drill bits by ensuring optimal performance and reducing wear and tear.
- Regular Cleaning: Keeping your cobalt drill bits clean is crucial to maintaining their sharpness and efficiency. After use, clean the bits with a soft brush or cloth to remove any metal shavings or debris that can cause corrosion and dullness.
- Proper Storage: Storing your drill bits correctly helps prevent damage and maintains their sharp edges. Use a dedicated storage case or rack that protects the bits from moisture and physical impacts, ensuring they remain in optimal condition.
- Sharpening: Regularly sharpening your cobalt drill bits can restore their cutting edge and prolong their usability. Use a sharpening tool specifically designed for drill bits to maintain the correct angle and avoid damaging the bit.
- Correct Usage: Using cobalt drill bits for their intended purposes helps prevent premature wear. Ensure you’re using the right speed and pressure for the material being drilled, as excessive force or incorrect settings can lead to overheating and damage.
- Lubrication: Applying cutting fluid or lubricant while drilling can reduce friction and heat, which are detrimental to cobalt bits. This not only improves performance but also minimizes wear, helping the bits last longer.
- Avoiding Overheating: Preventing overheating during use is essential for maintaining the integrity of cobalt drill bits. Take breaks during extended drilling sessions to allow the bits to cool down, as excessive heat can weaken the material and lead to failure.