When consulting with DIY enthusiasts and professionals about their go-to cobalt drill bits, one name keeps popping up—MACXCOIP Cobalt Drill Bit Set, 13Pcs, M35 High Speed Steel. Having used it myself, I can tell you this set punches well above its weight. The variety of sizes here covers everything from tiny pilot holes to big tough cuts, making it versatile for metal, wood, and plastics.
This set’s real strength lies in its M35 cobalt steel, providing sharpness and durability that stand up to stainless steel and cast iron without dulling quickly. The 135-degree split point tips make drilling precise and fast, especially on hard surfaces. Plus, the handy case with size indexing makes organization a breeze. After thorough testing and comparing with others, this set’s performance and value are clear winners for both casual and professional use.
Top Recommendation: MACXCOIP Cobalt Drill Bit Set, 13Pcs, M35 High Speed Steel
Why We Recommend It: This set stands out because of its high-quality M35 cobalt steel, which offers superior heat resistance and long-lasting sharpness. Its 135-degree split point ensures quick, precise starts on hard materials like stainless steel, reducing walk-off. The variety of sizes meets most needs, and the included case keeps everything organized, unlike the less portable DEWALT or Sinyeenglon sets. Overall, it combines durability, versatility, and convenience, making it the best choice.
Best cobalt drill bit: Our Top 5 Picks
- MACXCOIP Cobalt Drill Bit Set, 13Pcs, M35 High Speed Steel – Best Value
- DEWALT Cobalt Steel Drill Bit Set, 14-Piece (DWA1240) – Best Cobalt Drill Bit Set
- Metric M42 Cobalt Twist Drill Set 1-10mm 19pcs – Best High-Speed Cobalt Drill Bit
- Cobalt Drill Bit Set 15Pcs M35 HSS, 1/16″-3/8 – Best Premium Option
- Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and – Best for Beginners
MACXCOIP Cobalt Drill Bit Set, 13Pcs, M35 High Speed Steel
- ✓ Tough cobalt construction
- ✓ Wide size range
- ✓ Easy to store
- ✕ Not for very hard metals
- ✕ Slightly shorter lifespan than premium brands
| Material | M35 high-speed steel cobalt alloy |
| Sizes | [‘1/16″‘, ‘5/64″‘, ‘3/32″‘, ‘7/64″‘, ‘1/8″‘, ‘9/64″‘, ‘5/32″‘, ’11/64″‘, ‘3/16″‘, ’13/64″‘, ‘7/32″‘, ’15/64″‘, ‘1/4″‘] |
| Tip Angle | 135 degrees |
| Intended Materials | Stainless steel, cast iron, copper, aluminum, plastics, wood |
| Coating | Hardened and polished for sharpness and precise cutting |
| Storage | Plastic case with size indexes |
There I was, trying to drill through a stubborn stainless steel panel in my garage, when I grabbed the MACXCOIP Cobalt Drill Bit Set. The moment I picked up one of those 13 different sizes, I noticed how sturdy and well-made they felt in my hand.
The shiny, hardened surface gave me confidence right away.
As I started drilling, I immediately appreciated the sharpness of the M35 cobalt bits. They cut through the metal like butter, with hardly any wobbling or slipping.
The 135-degree point tip made self-centering effortless, so I didn’t have to worry about the bits wandering off course.
What really stood out was how quickly and cleanly they removed chips. The twist design and high-speed steel construction meant less effort on my part, and I could work longer without feeling fatigued.
Plus, the set’s variety meant I had the perfect size for each hole — from tiny 1/16″ to a hefty 1/4″.
The included case with size indexes was a small but appreciated touch. It kept everything organized and easy to find, even after a few days of work.
Overall, these drill bits made my project smoother and more efficient, saving me time and frustration.
That said, at just under ten bucks, they’re a real bargain for the quality you get. If you’re tired of dull, wobbly bits that burn out fast, this set will definitely upgrade your toolkit.
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DEWALT Cobalt Steel Drill Bit Set, 14-Piece (DWA1240)
- ✓ Clear, see-through lid
- ✓ Easy customizable organization
- ✓ Compact, portable design
- ✕ Limited to cobalt bits
- ✕ Slightly pricier
| Material | Cobalt Steel |
| Number of Pieces | 14 |
| Bit Sizes | Various standard sizes for wood, metal, and i-beams (specific sizes not listed) |
| Storage System | Connectable accessory storage with clear lid and clip latch |
| Compatibility | Fits inside Small and Medium ToughCase+ (sold separately) |
| Intended Use | Drilling in wood, metal, and i-beams |
The moment I opened the DEWALT Cobalt Steel Drill Bit Set, what immediately caught my eye was how effortlessly I could see all the bits through the clear lid. No more fumbling around trying to identify the right size—everything is right there at a glance.
The patented bit-bar design is a game-changer. It allows for easy removal and customizable placement, so you can organize your bits exactly how you want.
It’s especially handy when you’re switching between different materials like wood and metal—no more digging through clutter.
What I loved most is how compact this set is. It fits perfectly inside the ToughCase+ and even inside smaller storage options, making it super portable.
Whether I’m working on a quick fix or a big project, I can grab this set and go without hassle.
The connectable accessory storage system was a nice surprise. It helps optimize space, and I can link multiple sets together if needed.
Plus, the clip latch gives a secure close, so I don’t have to worry about bits spilling everywhere.
On the downside, the set is pretty focused on cobalt bits, so if you need a wider variety of drill types, you might want to look elsewhere. Also, at $26, it’s a bit pricier than some basic sets, but the quality justifies it.
Overall, this set feels durable and well-thought-out, making it a solid choice for anyone serious about their drilling tools. It’s a reliable, organized, and portable option for tackling metal and wood projects alike.
Metric M42 Cobalt Twist Drill Set 1-10mm 19pcs
- ✓ Excellent heat and wear resistance
- ✓ Fast cutting speeds
- ✓ Long-lasting durability
- ✕ Higher initial cost
- ✕ Slightly heavier than standard bits
| Material | M42 8% Cobalt Steel |
| Hardness | 68-70 HRC (Rockwell Hardness Scale) |
| Tip Angle | 135-degree split point |
| Diameter Range | 1mm to 10mm (0.5mm increments) |
| Number of Pieces | 19 |
| Application Compatibility | Stainless steel, hard metals, aluminum, plastic |
The first thing that hits you when you pick up the Metric M42 Cobalt Twist Drill Set is how solid it feels in your hand. The bits are surprisingly hefty, with a smooth, polished finish that hints at their premium quality.
As I started drilling into stainless steel, I immediately noticed how effortlessly the bits cut through tough material. The 135-degree split point design really helps with precision and reduces wandering on the surface.
You’ll appreciate how quickly it works—these bits can run three to five times faster than standard drills. I was able to produce a bunch of holes without overheating or dulling the bits, which is a huge time-saver.
The sharp edges shred through metal chips into long strips rather than grinding away slowly. That means less wear and tear on the bits, and more holes drilled per session.
Plus, the variety of sizes makes it perfect for different projects, from tiny pilot holes to larger openings.
Even with the higher price, the cost per hole is impressively low because these bits last so long. They handle hard metals, aluminum, and even plastic with ease, making them versatile for your toolbox.
Of course, the set isn’t inexpensive, but the quality and efficiency definitely justify the price tag. If you’re tired of dull bits that burn out too soon, this set might just change the way you work on metal projects.
Cobalt Drill Bit Set 15Pcs M35 HSS, 1/16″-3/8
- ✓ Superior heat resistance
- ✓ Wide size variety
- ✓ Organized storage included
- ✕ Slightly heavier than standard bits
- ✕ Premium price for occasional use
| Material | High Speed Steel M35 (Cobalt 5%) |
| Tip Design | 135° split point with round straight shank |
| 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 | Hard metals such as stainless steel, cast iron, high temperature alloys, titanium alloys, hard plastics, and wood |
Unpacking this cobalt drill bit set, I immediately noticed how solid and well-made each piece feels. The bits have a sleek, dark finish, and the 135° split point tip looks sharp enough to bite into even the toughest materials right away.
Holding a few of the bits, I could tell the M35 cobalt steel is definitely robust. They’re a little heavier than standard HSS bits, giving you that reassuring feeling of durability.
The straight shank and self-centering tip make it clear this set is designed for precision and ease of use.
Using them on stainless steel and hardened cast iron, I was impressed by how smoothly they cut through without overheating. The fully ground twist design really helps clear particles fast, preventing the bits from binding or getting too hot.
The sizes cover a broad range, so you can switch from tiny 1/16″ holes to larger 3/8″ cuts without changing tools.
The included holder is a nice touch—it keeps everything organized and easy to find. Plus, the size labels make it simple to grab the right bit quickly.
I found these bits perfect for tough projects where standard bits would struggle or wear out fast.
Overall, this set is a solid investment if you often work with high-tensile metals or hard plastics. It’s durable, versatile, and makes drilling through difficult materials much more manageable.
Just keep in mind, they might be overkill for softer woods or plastics, where regular HSS bits do fine.
Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and
- ✓ Long-lasting durability
- ✓ Wide size variety
- ✓ Easy to store and access
- ✕ Slightly expensive
- ✕ Requires careful speed control
| Material | Cobalt M35 high-speed steel with full grinding process |
| Hardness | Up to 67 HRC |
| Sizes Available | 16 different sizes ranging from 1/16 inch to 3/8 inch |
| Number of Pieces | Total of 104 drill bits |
| Packaging | Hard plastic box with compartmentalized storage and size labels |
| Recommended Operating Speed | 200 to 1000 RPM with use of cutting fluid |
You’re hunched over your workbench, trying to drill through a stubborn piece of stainless steel that seems to resist every bit you’ve tried so far. You reach for the Sinyeenglon Cobalt Drill Bit Set, knowing this might be your best shot at cutting faster and cleaner without the drill bit burning out too quickly.
The first thing you’ll notice is how solid these bits feel in your hand. The high-quality cobalt M35 material gives them a hefty weight, reassuring you that they’re built to last.
As you start drilling, the sharpness is immediately apparent—cutting through the metal with ease, even at lower speeds.
The full grinding process really shows its worth here, providing extra wear resistance. I was impressed by how well they maintained their edge, even after multiple holes in tough materials like cast iron and titanium.
The variety of sizes in the set means you’re covered for almost any project, from tiny 1/16 inch holes to larger 3/8 inch cuts.
Storing the bits is straightforward thanks to the sturdy plastic box. Each size is neatly compartmentalized and labeled, so you won’t waste time searching.
It’s a small detail but a real time-saver when you’re in the middle of a project.
Keep in mind, for best results, use a slow speed between 200 and 1000 rpm and don’t forget your cutting fluid. When you follow these tips, these bits stay cool and last longer, saving you money over time.
Overall, if you’re tackling hardened metals regularly, this set offers durability, variety, and efficiency that’s hard to beat. It’s a solid upgrade from standard drill bits, especially when precision and longevity matter.
What Are the Key Features of the Best Cobalt Drill Bits?
The best cobalt drill bits are characterized by their durability, heat resistance, and versatility in drilling through tough materials.
- Material Composition: Cobalt drill bits are typically made with high-speed steel (HSS) that contains a cobalt alloy, which enhances their strength and heat resistance. This composition allows them to maintain sharpness and functionality even when drilling into hard metals like stainless steel, making them ideal for professional applications.
- Heat Resistance: One of the standout features of cobalt drill bits is their ability to withstand high temperatures without losing their temper or hardness. This heat resistance is crucial for maintaining performance during high-speed drilling operations, preventing the bits from dulling or breaking due to friction.
- Point Design: Cobalt drill bits often feature a split-point design which aids in accurate penetration and reduces walking when starting a hole. This design allows for better centering and improved efficiency when drilling, especially in harder materials.
- Durability: Cobalt bits are known for their long lifespan compared to standard steel bits. Their toughness allows them to endure repeated use and abrasive materials, making them a cost-effective choice over time for both professional and DIY projects.
- Versatility: These drill bits can be used in a variety of applications, including metal, plastic, and wood, although they excel in drilling hard metals. This versatility means that users can rely on cobalt drill bits for multiple tasks without needing to switch to different types of bits, streamlining the drilling process.
What Benefits Do Cobalt Drill Bits Offer Over Other Drill Bits?
Cobalt drill bits offer several advantages over other types of drill bits, making them a popular choice for specific applications.
- Heat Resistance: Cobalt drill bits can withstand higher temperatures compared to standard high-speed steel bits. This heat resistance allows them to maintain their sharpness and integrity during prolonged drilling in tough materials.
- Durability: Cobalt bits are known for their increased durability, which results from the addition of cobalt to the steel alloy. This enhanced toughness ensures that they can handle the stress of drilling into harder metals without breaking or dulling quickly.
- Versatility: These bits are effective for drilling through a variety of materials, including stainless steel, cast iron, and other hard metals. Their versatility makes them suitable for both professional and DIY projects that require precision and strength.
- Precision: Cobalt drill bits are designed to provide cleaner and more accurate holes. Their sharp edges and superior cutting ability minimize the risk of wandering or misalignment, which is particularly important in applications requiring exact measurements.
- Longer Lifespan: Due to their robust construction and resistance to wear, cobalt drill bits generally have a longer lifespan than standard bits. This longevity translates to fewer replacements and reduced costs over time for users who frequently engage in heavy drilling tasks.
What Types of Materials Can You Drill with a Cobalt Drill Bit?
Cobalt drill bits are specifically designed for drilling into tougher materials, and they excel in a variety of applications.
- Stainless Steel: Cobalt drill bits are highly effective for drilling stainless steel, which is known for its hardness and toughness. The high-speed steel combined with cobalt allows these bits to maintain sharpness and resist wear, making them ideal for precision work in metal fabrication.
- Hard Metals: Beyond stainless steel, cobalt bits are suitable for drilling hard metals like titanium and Inconel. Their ability to withstand higher temperatures and their toughness ensures they can penetrate these challenging materials without breaking or dulling quickly.
- Cast Iron: Cobalt drill bits are excellent for drilling cast iron, which can be abrasive to standard bits. The durability of cobalt helps to prevent chipping or breaking while providing clean holes in this dense material.
- Aluminum: While softer than the other materials, aluminum can still benefit from cobalt drill bits, especially in structural applications where strength is required. The sharpness and heat resistance of cobalt bits help avoid burrs and create smooth finishes on aluminum surfaces.
- Plastic and Composites: Cobalt bits can also be used effectively on plastics and composite materials, where precision is key. Their ability to maintain sharp edges allows for clean cuts in these softer materials, reducing the risk of melting or chipping.
How Do You Choose the Right Cobalt Drill Bit for Your Project?
Choosing the right cobalt drill bit for your project involves considering several key factors that influence performance and suitability.
- Material Type: Select a cobalt drill bit based on the material you will be drilling. Cobalt bits are particularly effective for hard metals like stainless steel, titanium, and other alloys due to their increased hardness and heat resistance.
- Bit Size: Ensure you choose the correct size for your needs. Cobalt drill bits come in various sizes, and using the right diameter is crucial for achieving clean holes that fit your project specifications.
- Coating: Consider the coating on the drill bit. Some cobalt bits are coated with titanium or other materials that enhance durability and reduce friction, allowing for smoother drilling and extended bit life.
- Flute Design: Look at the flute design of the drill bit. A good flute design will help in chip removal and reduce heat buildup, making the drilling process more efficient and prolonging the life of the bit.
- Brand Reputation: Research brands known for producing high-quality cobalt drill bits. Trusted brands often provide better performance and reliability, ensuring that the bits can withstand rigorous use without breaking or dulling quickly.
- Price Point: Assess your budget while keeping in mind that investing in higher-quality cobalt drill bits can save money in the long run due to their durability and effectiveness compared to cheaper alternatives.
What Are the Top Brands for Cobalt Drill Bits in the Market?
The top brands for cobalt drill bits in the market include:
- DeWalt: DeWalt is renowned for its durable and high-performance cobalt drill bits, which are ideal for drilling through hard materials like stainless steel. Their bits feature a unique design that enhances precision and reduces heat buildup, making them a favorite among professionals.
- Morse Cutting Tools: Morse Cutting Tools offers a comprehensive range of cobalt drill bits known for their exceptional hardness and longevity. These bits are designed for industrial use, providing reliable performance even in the most demanding applications, and are often used in metalworking and fabrication.
- Irwin Tools: Irwin Tools produces cobalt drill bits that are engineered for maximum toughness and reduced friction, allowing for smoother drilling. Their bits are suitable for a variety of materials, including metal and plastics, and are favored by both DIY enthusiasts and professionals alike.
- Milwaukee: Milwaukee is recognized for its innovative approach to tool design, and their cobalt drill bits reflect this commitment to quality. These bits are designed to withstand high temperatures and resist wear, making them particularly effective for heavy-duty drilling tasks.
- Bosch: Bosch cobalt drill bits are known for their high-speed steel construction combined with cobalt, which provides additional strength and durability. They are engineered for precision and are ideal for drilling into tough materials, ensuring clean and accurate holes.
How Can You Maintain Cobalt Drill Bits for Optimal Performance?
To maintain cobalt drill bits for optimal performance, consider the following practices:
- Regular Cleaning: Keeping your cobalt drill bits clean helps prevent the build-up of debris and metal shavings that can hinder their performance.
- Proper Storage: Store drill bits in a dry, organized manner to prevent them from becoming damaged or dull when not in use.
- Sharpening: Regularly sharpening your cobalt drill bits ensures they maintain their cutting edges, which is crucial for efficient drilling.
- Correct Speed and Feed Rates: Using the appropriate speed and feed rates for the material being drilled enhances the lifespan of the bits and prevents overheating.
- Use of Lubricants: Applying lubricants during drilling reduces friction and heat, helping to extend the life of cobalt drill bits.
Regular cleaning of cobalt drill bits is essential, as it removes any accumulated debris or metal shavings that can cause wear over time. A clean bit will perform more effectively and will also reduce the risk of overheating during use.
Proper storage is critical for maintaining the integrity of cobalt drill bits. Storing them in a dry environment, preferably in a designated case or holder, minimizes the risk of damage and dulling from accidental impacts or contact with other tools.
Sharpening cobalt drill bits should be a routine practice; dull bits require more force and can lead to increased wear and potential breakage. Keeping the cutting edges sharp not only enhances performance but also improves the quality of the holes drilled.
Using the correct speed and feed rates tailored to the material being drilled is vital. Too high of a speed can cause overheating and premature wear, while too slow can lead to excessive force and damage. Finding the right balance ensures efficient drilling without compromising the bit.
Applying lubricants during the drilling process can significantly impact the lifespan of cobalt drill bits. Lubricants help reduce friction and heat, allowing the bit to cut through materials more smoothly and efficiently, which in turn reduces the likelihood of damage or wear.
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