10 Best Drill Bits For Drilling Steel in 2026

The Bosch CO21B set brings serious metalworking credentials to your drill press with its M42 cobalt construction containing 8% cobalt alloy. That composition gives these bits exceptional heat resistance when working through stainless steel, cast iron, or titanium, letting you push them harder without immediate failure. The split point design on bits over 1/8 inch means they bite immediately without wandering, saving you the step of center punching every hole. Combined with the three-flat shank that prevents slipping in the chuck, this set is built for precision work on demanding materials where control matters most.

The Bosch CO21B bits are built for tough materials like stainless steel and titanium, with an M42 cobalt alloy that Bosch says delivers ten times the life of standard bits. This means they can handle high-heat applications longer before wearing out, which is useful for repeated drilling in hard metals. In a comparative test of cobalt bits drilling 6mm stainless steel, the best Bosch cobalt model drilled 15 holes, while a specialized competitor’s bit drilled 135 holes. For a user drilling many holes in such materials, a more durable bit could offer a lower cost per hole over time.

The TiAlN coating that withstands temperatures exceeding 1,472°F gives these bits a serious edge in longevity when drilling hard metals. This heat resistance directly translates to maintaining a sharp cutting edge through demanding jobs, which lowers your long-term replacement costs. Combined with the M35 cobalt steel core’s hot hardness, this set is engineered specifically for the unique challenges of thin, hard materials like stainless steel and titanium. It’s a solid choice for anyone regularly working with sheet metal who wants professional results with minimal post-processing time.

You do need to apply the proper technique, firm, steady vertical pressure at startup, to engage that self-centering Pilot Point and prevent skating. The tip design also changes between the smaller and larger bits in the set, which is worth noting if you prefer consistency across all diameters. For the money, though, you’re getting a well-thought-out kit with smart duplicates of the most vulnerable sizes and a storage case that actually protects your investment.

Covering sizes from 9/16-inch to a full inch without skipping sixteenth-inch increments, this set provides a full range of large-diameter drill bits for steel plate and structural work. Its M2 high-speed steel construction and 135-degree split point are designed for the sustained heat and pressure of drilling thick metal. The reduced, tri-flatted shank also locks securely in a standard chuck to handle the torque, making this a set for metalworking tasks that require large holes.

The trade-off is scope. You’re buying a specialist set for big holes, so you’ll need a separate collection for pilot drilling or general work below 9/16-inch. For a more comprehensive range that starts at 1/16-inch, the Bosch CO21B Cobalt M42 set is the obvious comparison, though it maxes out at 1/2-inch. The EFFICERE set’s aluminum case and lack of skipped sizes make it a logical, no-nonsense expansion for your toolbox when the job calls for serious metal.

Five bits covering 50 hole sizes lets you tackle a wide range of DIY and general drilling projects without constantly changing tools. This IRONANT set uses high-speed steel with a titanium coating for wear resistance and consistent sharpness through repeated use. The bits are designed for plastic, aluminum, iron, and various sheet metals, providing clean holes across those common materials.

These bits have clear material limitations. They are not meant for stainless steel, so you’ll need a harder cobalt option like the Bosch CO21B set for that kind of work. And while the step design is brilliant for versatility in sheet goods, it’s the wrong tool if your project calls for drilling many deep, single-diameter holes. For that, a traditional jobber-length set is more efficient.

An impact-rated hex shank means this set is built to survive the brutal, hammering action of an impact driver without slipping or snapping. That’s the core reason it’s a perfect match for anyone who regularly drives screws into steel framing or uses an impact driver as their primary drilling tool. The no-skate tip and titanium coating are smart features that translate directly to less wandering on curved surfaces and smoother cutting with less applied pressure. If your workshop rhythm involves grabbing an impact driver first, these bits are designed for your workflow.

The Bosch TI9IM is a 9-piece set designed specifically for impact drivers and heavy-gauge steel, so it’s built for high-torque applications where standard bits might fail. Its titanium nitride coating reduces friction, which can help with heat management and bit life during demanding jobs. The hex shank and impact-rated construction mean it’s intended to handle the abrupt force pulses from an impact driver, not just a standard drill.

The NordWolf M35 Cobalt set features a 1/4-inch hex shank, which is compatible with standard and quick-change chucks and drivers. This design allows for fast bit changes without needing to tighten a three-jaw chuck. The bits are made from M35 cobalt steel and have a 135-degree split point tip, a combination the manufacturer states is suitable for drilling stainless steel, cast iron, and other hardened metals.

Its maximum diameter of 1/4 inch means these bits are for precise, smaller-scale metalwork, not for drilling large holes for plumbing or electrical conduit. If your projects routinely need larger holes in steel, a set like the EFFICERE Premium M2 HSS with its 1/2-inch capacity is a more suitable, though less specialized, toolkit addition. For its core task of drilling tough metals with a hex-shank tool, however, this NordWolf set is sharply focused.

The Speed Tip design is the key feature here, as it bites into the material immediately to prevent the bit from skating around on curved or hard steel surfaces. This set is built for the workshop tackling a mix of materials, from metal and wood to plastics. The titanium nitride coating adds wear resistance, giving you more holes per bit before it dulls, and the no-spin shanks lock firmly into any standard chuck. It’s a solid, organized kit for someone who needs reliable bits for everyday fabrication and repair, not just occasional use.

The coating is a point of comparison. While titanium nitride is applied for longer life, cobalt alloys like M35 in other sets are formulated for different applications. For tasks involving constant drilling into stainless steel or cast iron, a dedicated cobalt set like the Bosch CO21B is listed as an alternative. The DeWalt DW1341 finds its sweet spot in general metalwork where you’re not constantly pushing the limits of the material or the bit.

The M35 cobalt construction is the key here, giving these bits the heat resistance and hardness to chew through stainless steel sheet. That makes this set a solid pick for a metalworker or serious DIYer who regularly needs to create or enlarge clean holes in tough alloys. The TiAlN coating is a welcome feature that fights wear, and the hex shank provides a secure grip in any drill chuck. You get three bits that cover a logical progression from quarter-inch up to seven-eighths of an inch, which handles a lot of common plumbing and fabrication tasks.

Using cutting oil or water spray during operation is a necessity, not just a suggestion, to prevent overheating and maintain the bits’ lifespan. This is especially important for drilling abrasive alloys. While the set contains three bits, compared to the five-piece IRONANT TiAlN Coated Step Drill Bit Set, it focuses on a versatile range of step sizes within each tool. The construction uses M35 high-speed steel with 5% cobalt, a material noted for durability and cutting performance on hard metals.

Twelve identical 1/4-inch bits in one pack provide a ready supply for continuous drilling, reducing downtime for sharpening or replacement. Made from M35 steel with 5% cobalt for higher heat resistance, these bits are designed for hard metals like stainless steel, which helps them maintain a sharp edge through demanding applications. The 135-degree split point and three-flat shank aid in precise starting and secure chuck grip during use.

This pack offers depth in a single 1/4-inch size rather than a range of diameters. For tasks requiring multiple hole sizes, a set like the Bosch CO21B Cobalt M42 provides assorted bits. The Drill Hulk pack focuses on supplying multiple units of one specific jobber-length bit.

Its triple-flute geometry is the standout feature, providing a smoother finish, faster drilling, and better accuracy by ejecting chips about 40% more effectively. That means less heat buildup and a cleaner hole in abrasive alloys or hardened cast iron. For anyone regularly drilling into hard metals, this design directly addresses the core frustrations of bit walk, poor finish, and overheating. It’s a premium, well-thought-out set for the metalworker or serious DIYer who demands precision and longevity from their tools.

The triple-flute design is recommended for standard depth of cut applications, positioning it as a precision tool for controlled drilling rather than for extreme-depth or heavy impact use. Among other products, the Bosch TI9IM set carries an ‘Impact Tough’ designation, suggesting a different design focus. For drilling hardened metals where finish and accuracy are critical, the Crosstar set’s specialized geometry and heat-resistant coating make it a focused choice.