10 Best Bits For Drilling Steel in 2026

The Bosch CO21B’s M42 alloy with 8% cobalt is the key. That composition gives these bits the heat tolerance to power through stainless steel and cast iron without immediately losing their edge. For a tradesperson or serious DIYer who regularly encounters a mix of hard metals, this set delivers the balanced durability and feature set you need. The split points and three-flat shanks mean you spend less time fighting to start a hole or worrying about bit slippage, letting you focus on the work.

This 21-piece M42 cobalt set from Bosch is built for tough metal drilling, not light-duty tasks. The bits contain 8% cobalt alloy, which Bosch states delivers ten times the life of standard bits under ideal conditions. A thick web-helix design adds stability in tough applications, and split points on bits 1/8 inch and larger help prevent skating for easier starts.

A 29-piece set of M35 cobalt bits covering every 1/64″ increment from 1/16″ to 1/2″ means you’re equipped for nearly any hole size in steel without guesswork. The gold oxide finish isn’t just for show; it reduces friction and wear, which matters when you’re pushing through stainless all afternoon. This set is for the fabricator or serious DIYer who drills metal regularly and needs a comprehensive, durable kit without stepping into pro-tier pricing. The cobalt content provides a clear step up from standard high-speed steel, offering better heat resistance and a longer useful life.

The alloy choice presents a practical balance. While this set uses M35 cobalt, research that selected a competitor’s M42 cobalt bits as best for hardened metal and stainless steel suggests a difference in specialized applications. These are versatile jobber-length bits, a standard profile for most shop tasks. For fabricators and serious DIYers who drill metal regularly, the set delivers comprehensive sizing and cobalt performance at a non-professional-tier price.

The Milwaukee Red Helix set uses M35 cobalt, a sweet spot for drilling steel that delivers reliable performance without a premium price tag. This 29-piece collection is the one to grab when you need a comprehensive range of sizes on hand for shop or jobsite metalwork. Its shorter, compact bit design is specifically engineered for cordless drills, maintaining useful drilling depth while improving handling and balance in the tool chuck.

Milwaukee’s Red Helix Cobalt bits are recommended for general steel drilling with a cordless drill, balancing price and performance. Their design is more compact, with flutes extending further up a shorter shaft to maintain drilling depth. This geometry makes them a go-to choice for routine metalworking tasks.

Being impact-rated for a 1/4-inch hex driver means you can drive these bits directly with your impact driver, turning that high-torque tool into a capable metal drill. That’s the core appeal for anyone who wants to skip chuck changes and drill steel directly from their impact driver. The titanium nitride coating promises extended life, and the 135-degree split point helps keep the bit from skating on hard surfaces. This set suits a tradesperson or serious DIYer who works with mixed materials and values the speed of an impact driver.

This set is impact-rated for use in 1/4-inch hex drivers, so it’s ready for the high-torque demands of an impact driver right out of the case. Its 14-piece count offers a focused selection rather than the expansive range of a 29-piece set like the DEWALT Titanium Nitride Pilot Point. You choose between maximum versatility for a drill press or the driver-ready convenience of the Makita design, which is purpose-built for drilling materials like steel with an impact tool.

A 29-piece set with a pilot point tip that starts on contact means you get cleaner, more accurate holes in steel without the bit walking. The titanium nitride coating extends life significantly over standard bits, a major advantage for frequent drilling. This combination makes it a standout for tradespeople and serious DIYers who need predictable performance and reduced bit changes on the job site.

For drilling a variety of steels and general metalwork, the DEWALT set’s pilot point accuracy and included case offer a practical, workshop-ready solution. Its titanium nitride coating is noted for longer bit life, and the tapered web design aims to reduce breaking. The set balances performance and value for typical shop tasks.

The 135-degree stepped point is the key here. That aggressive split tip bites into steel and acrylic with less walking, so you spend less time center-punching and more time making chips. Combined with the gold oxide cobalt construction, which research selected for hardened metal, this set is built for the repeated demands of drilling tough materials. It’s the right pick for a fabricator or serious DIYer who regularly needs to open up or enlarge existing holes and wants a bit that starts cutting immediately.

You’re getting a full 29-bit range up to a half-inch, but the trade-off is a standard jobber length. That’s fine for most plate and angle iron, but it won’t reach deep into a structural beam. For general-purpose steel drilling where a stepped point isn’t critical, other cobalt sets like the Bosch CO21B are available. The Drill America set, however, excels at its specific task: creating clean, accurately placed holes in sheet metal and hard alloys without the fuss.

Impact-rated hex shanks allow higher torque from impact drivers without slipping in the chuck, which is essential for the demanding steel drilling this set targets. Bosch designed these bits specifically for heavy-gauge and high-carbon steel. Their no-skate tip promises accurate starts, and the titanium coating is intended to reduce friction during use.

The clear trade-off is in the selection. With just nine bits, you’re covered for common tasks but not for a wide range of precision hole sizes. For extensive fabrication work requiring a full spectrum of bits, you’d want a larger kit like the Drill America DWD29J set. This Bosch set excels as a targeted, no-nonsense solution kept in your impact driver’s case for when you absolutely need to punch through thick metal without the bit failing.

A TiAlN coating that withstands 1472°F is the standout feature here, directly tackling the single biggest enemy of drill bit life when working steel. That extreme heat resistance, paired with M35 cobalt steel, makes this set a logical choice for anyone regularly drilling stainless steel, titanium, or other hardened alloys where heat buildup ruins ordinary bits. The triple-flute geometry isn’t just for show, it actively pulls chips out faster to run cooler and leaves a cleaner hole. You get a comprehensive 21-piece range and the absolute grip of a three-flat shank, which is essential when pushing an impact driver.

Specialization defines this set. Its M35 cobalt steel and TiAlN nano-coating are engineered for sustained drilling in hardened metals up to 60 HRC, which means extended tool life under high-heat conditions. For frequent work on stainless steel, titanium alloys, or hardened cast iron, that heat resistance justifies the investment. The triple-flute design also improves chip ejection and hole finish in these tough applications.

The standout feature here is the 8.8-inch compact case that weighs less than a pound, making it incredibly easy to toss in a tool bag or drawer without sacrificing organization. The patented bit-bar and connectable system are brilliant for tradespeople or serious DIYers who hate fumbling for loose bits. This set is for the user who values a tidy, portable kit for common metalworking tasks and appreciates DEWALT’s thoughtful storage engineering.

Its patented bit-bar design makes it easy to remove drill bits and customize their placement, which is a major advantage when you’re switching sizes mid-project. The clear lid lets you see the contents at a glance, and the clip latch keeps everything securely closed. For a mechanic or DIYer, this storage system turns a jumble of bits into a neatly organized, portable kit.

A 5% cobalt M35 composition gives these bits the heat resistance and hardness needed for tough metals like stainless steel and cast iron, making them a legitimate step up from standard HSS. The 135-degree split point starts holes accurately without wandering, a critical feature for clean work. For a DIYer or occasional metalworker needing to drill hard materials without breaking the bank, this set delivers the core cobalt performance where it counts, housed in a simple, organized case.

This set focuses on common small-to-medium metal drilling tasks, stopping at a 1/4″ maximum diameter, so you’ll need another set for larger holes. It’s a budget-friendly, focused toolkit rather than a comprehensive shop solution.