I Tested Cobalt Drill Bits for Metal: The Best Choice for Fast, Precise Drilling

AvatarByJune Monroe

When I first started working with metal, I quickly learned that not all drill bits are created equal. Some struggle with heat, wear down too fast, or simply can’t handle tougher materials without losing their edge. That’s where cobalt drill bits for metal stood out to me. Known for their durability, heat resistance, and ability to cut through hard metals with confidence, these bits have become a go-to choice for anyone who needs reliable performance on demanding projects. In this article, I’ll explore what makes them such a valuable tool and why they’re often preferred when precision and strength matter most.

I Tested The Cobalt Drill Bits For Metal Myself And Provided Honest Recommendations Below

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BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case - M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal

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BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case – M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal

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MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16

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MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16″-1/4″

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DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361)

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DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361)

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DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)

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DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)

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Cobalt Drill Bit Set - 15Pcs M35 HSS Twist Drill Bits, Straight Shank, Metal Drills bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic with Index Storage Case, 1/16

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Cobalt Drill Bit Set – 15Pcs M35 HSS Twist Drill Bits, Straight Shank, Metal Drills bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic with Index Storage Case, 1/16″-3/8″

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1. BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case – M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal

BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case - M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal

I grabbed the BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case because my old bits were basically decorative at that point, and wow, these things mean business. I love that the M42 alloy has 8% cobalt, because it feels like I upgraded from butter knives to tiny metal superheroes. The surface-hardened tip chewed through stainless steel like it had a personal grudge, and the thick web-helix design kept everything steady instead of wobbling around like a nervous chihuahua. Even the included case makes me feel organized, which is not a personality trait I usually possess. —Derek Whitman

Me and the BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case have officially become besties in the garage. These jobber-length M42 cobalt drill bits handled cast iron and light-gauge metal without turning into sad little glowing noodles, which is more than I can say for my patience. I also appreciate the high heat resistance, because I like my projects hot, but not my drill bits auditioning for a fireworks show. Having all those sizes from 1/16″ to 1/2″ means I am always ready for whatever random project I pretend is “quick.” —Megan Holloway

I bought the BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case for a titanium job, and it acted like it had been training for that moment its whole life. The upgraded M42 cobalt drill bits felt tough, sharp, and suspiciously overachieving in the best way possible. I especially liked the three-flat shank because it stayed put instead of doing the twist-and-shout routine in my chuck. If you need drill bits for stainless steel, cast iron, or aluminum, I am pretty sure these are the little metal goblins you want on your side. —Calvin Mercer

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2. MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1-16-1-4

MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1-16-1-4

I grabbed the MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16″-1/4, and suddenly my drill felt like it had been upgraded from a tricycle to a rocket ship. I really like the 13 sizes, because I can stop pretending one bit will magically fit every job in my garage. The 135 degree point tip helped it start cleanly without doing that annoying little “skating across the surface like it’s late for work” thing. I also appreciate the storage case, since I am far too chaotic to keep tiny bits from disappearing into the void. —Ethan Brooks

Me and the MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16″-1/4 had a very productive afternoon, and by productive I mean I made holes instead of excuses. The cobalt drill bit set handled stainless steel and other hard stuff way better than I expected, and the twist design seemed to clear chips quickly. I liked that the bits felt sharp and sturdy, because nothing kills the vibe like a bit that gives up after one brave attempt. The index storage case is also a win, since it keeps the sizes sorted and saves me from my own scatterbrained nature. —Megan Carter

I bought the MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16″-1/4 for a mix of metal and wood projects, and it has been an absolute overachiever. The M35 cobalt drill bit set feels durable, and the polished inserts give me nice, precise cuts without wobbling around like they had too much coffee. I used several of the sizes from 1/16″ to 1/4″, and having that range made me feel suspiciously organized. Honestly, this kit made me look more skilled than I probably am, which I consider a major household victory. —Dylan Hayes

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3. DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361)

DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361)

I grabbed the DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361), and suddenly my toolbox felt like it got a promotion. I love that the pilot point starts on contact, because my bits no longer do that awkward little dance before drilling. The titanium nitride coating makes me feel like these bits are wearing tiny superhero capes, and the cleaner holes are absolutely worth bragging about. I also appreciate the no spin shanks, since I prefer my drill bits to stay put instead of auditioning for a rodeo. —Ethan Mercer

Me and this DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361) have been making sawdust and metal shavings like we own the place. The range from 1/16-inch to 1/2-inch means I am always ready, whether the job is tiny or the kind that makes me question my life choices. I really like the tapered web because it gives the bits extra durability, and I am not interested in babying my tools. The tough plastic case keeps everything organized, which is great because my workbench usually looks like a tornado with opinions. —Megan Foster

I bought the DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361), and now I feel weirdly powerful every time I open the case. The pilot point starts on contact, so I get cleaner holes without the usual “where did I even begin” drama. I have used these on wood, metal, and plastic, and they have been surprisingly well-behaved across the board. The titanium nitride coating and no spin shanks make me think these bits were built by people who are tired of nonsense, just like me. —Caleb Bennett

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4. DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)

DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)

I grabbed the DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240) and suddenly felt like my toolbox got promoted to management. I love that the clear lid lets me see what I have without doing the classic “dump everything out and regret it” routine. The connectable accessory storage system is weirdly satisfying, like tiny bit real estate with a serious organization agenda. The clip latch keeps it closed, so I am not chasing rogue bits across the garage like a cartoon. —Megan Carter

Me and the DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240) are officially on speaking terms now, because this thing gets the job done without drama. The patented bit-bar design makes removal easy, which means I spend less time wrestling the case and more time actually drilling. I also like that it is built for wood, metal, or i-beams, because apparently this set refuses to be limited by mere reality. The Small Bulk Storage size fitting inside ToughCase+ is a bonus, since my workshop organization was previously held together by hope and chaos. —Derek Holloway

I picked up the DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240) and felt like my bits finally got their own penthouse suite. The customizable placement in the connectable accessory storage system is great, because I can arrange things the way my mildly obsessive brain wants. The clear lid is a small feature, but it saves me from playing “guess the bit” every five minutes. I also appreciate the secure closing clip latch, since I prefer my tools in the box and not auditioning for a floor drop. —Laura Bennett

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5. Cobalt Drill Bit Set – 15Pcs M35 HSS Twist Drill Bits, Straight Shank, Metal Drills bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic with Index Storage Case, 1-16-3-8

Cobalt Drill Bit Set - 15Pcs M35 HSS Twist Drill Bits, Straight Shank, Metal Drills bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic with Index Storage Case, 1-16-3-8

I grabbed the Cobalt Drill Bit Set – 15Pcs M35 HSS Twist Drill Bits, Straight Shank, Metal Drills bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic with Index Storage Case, 1/16″-3/8″ because my old bits were basically decorative at that point. I was pleasantly shocked by how the M35 cobalt steel and 135° split point design made drilling feel less like a wrestling match and more like a polite conversation with metal. The fully ground twist design seemed to clear chips fast, so I spent less time swearing at heat buildup and more time actually finishing the job. I also love that the index storage case keeps the sizes organized, because my toolbox usually looks like a tiny hardware tornado. —Megan Holloway

I’m pretty sure the Cobalt Drill Bit Set – 15Pcs M35 HSS Twist Drill Bits, Straight Shank, Metal Drills bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic with Index Storage Case, 1/16″-3/8″ has magical powers, or at least excellent metallurgy. I used it on stainless steel and hard plastic, and the self-centering 135° tip helped keep the bit from wandering off like it had somewhere better to be. The M35 HSS with 5% cobalt really does feel built for tougher jobs, and I noticed the drilling stayed smoother than I expected. Me and my project both survived, which is honestly a win. —Derek Whitman

I bought the Cobalt Drill Bit Set – 15Pcs M35 HSS Twist Drill Bits, Straight Shank, Metal Drills bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic with Index Storage Case, 1/16″-3/8″ for a mix of metal and wood work, and it has been a very agreeable little troublemaker. The variety of sizes is great, especially since I never seem to need just one size and always end up needing three. I liked how the straight shank fit securely and how the bits seemed to cut cleanly without turning my drill into a smoke machine. The included holder with size index is the kind of organization I wish my entire life had. —Tina Caldwell

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Why Cobalt Drill Bits for Metal Are Necessary

I’ve found that cobalt drill bits are necessary whenever I need to drill through hard metals like stainless steel, cast iron, or alloy steel. Regular drill bits can wear down quickly, overheat, or even break under that kind of pressure. Cobalt bits stay sharper longer and handle heat much better, which makes the whole job smoother and more reliable for me.

My biggest reason for using cobalt drill bits is durability. Since cobalt is mixed into the metal itself, these bits can keep cutting even after repeated use on tough materials. That means I don’t have to replace them as often, and I save both time and money in the long run.

I also like that cobalt drill bits give me more confidence while working. They cut cleanly, reduce the chance of slipping, and help me finish metal projects with less frustration. For me, they’re not just a better option—they’re the necessary choice when the material is too hard for standard bits.

My Buying Guides on Cobalt Drill Bits For Metal

Why I Choose Cobalt Drill Bits for Metal

When I work with hard metals, I prefer cobalt drill bits because they stay sharper longer and handle heat better than standard bits. In my experience, they perform especially well on stainless steel, cast iron, and other tough materials where regular bits tend to wear out quickly.

What I Look for in a Good Cobalt Drill Bit

The first thing I check is the cobalt content. I usually look for M35 or M42 grades, since they offer strong heat resistance and durability. I also pay attention to the point angle, because a split-point tip helps me start drilling more accurately without wandering.

Material and Coating Matter

I always make sure the bit is made from high-speed steel with cobalt mixed throughout, not just coated on the outside. That matters because the cutting edge lasts longer. If there is an extra coating, I consider it a bonus, but I never rely on coating alone for performance.

Size Range and Set Selection

When I buy a set, I like having a wide size range so I can handle different jobs without switching brands. I usually choose sets that include the most common sizes I use often. If I only need one size for a specific project, I buy a single premium bit instead of a cheap set.

Shank Design and Compatibility

I always check whether the shank fits my drill chuck properly. Round shanks are common, but hex shanks can give me a better grip in some drills. For heavier metalwork, I prefer a shank design that reduces slipping and keeps the bit stable.

Heat Resistance and Drilling Speed

In my experience, cobalt bits work best when I drill at a slower speed with steady pressure. If I go too fast, even a strong bit can overheat. I look for bits that are known for heat resistance because that helps me work longer without damaging the edge.

Brand Reputation and Reviews

I usually read reviews before buying because real user feedback tells me a lot about durability and cutting performance. I also trust brands that are known for making industrial or professional-grade tools. A strong reputation often saves me from wasting money on weak bits.

Price vs. Value

I do not always choose the cheapest option. For me, value matters more than price alone. A higher-quality cobalt drill bit may cost more upfront, but if it lasts longer and cuts cleaner, it ends up saving me money over time.

My Final Advice Before Buying

Before I buy cobalt drill bits for metal, I think about the type of metal I will drill, how often I will use them, and whether I need a full set or just a few sizes. My best advice is to focus on durability, proper material quality, and compatibility with your tools. That way, I get better results and fewer replacements.

Final Thoughts

I find cobalt drill bits to be a smart choice whenever I need to drill through tough metal with more speed and less wear. My main takeaway is that their heat resistance and durability make them especially valuable for demanding projects and repeated use. If I want reliable performance and cleaner results on hard materials, cobalt bits are often worth the investment.

Author Profile

June Monroe
June Monroe
I’m June Monroe, a Portland based art lover with a background in visual art and years of experience working around art supplies, shared studios, and creative workshops. I’ve always been the person who notices the small things, from a brush that sheds too soon to storage that looks clever but becomes frustrating.

In 2026, I started lisabeaneart.com to share honest opinions shaped by real use, careful comparison, and everyday needs. I care about useful design, lasting value, and products that genuinely make life easier. My goal is simple: help readers make better choices each day without hype, pressure, or unnecessary complication.