10 Best Steel Drill Bits in 2026

An M42 cobalt alloy with 8% cobalt content means these bits can take the heat when you’re pushing through stainless steel or cast iron, so you can drill longer without stopping to cool them off. The split point on bits over an eighth of an inch bites in immediately, eliminating that frustrating skate across your workpiece and the need for a center punch.

Owner feedback notes these bits can wear out more quickly when used on work-hardened steel or without cutting fluid. The set includes a three-flat shank on bits 3/16 inch and larger for a better grip in the chuck. Compared to the 10-piece Spyder’s Mach Blue set that only goes to 3/8 inch, the Bosch set provides more bits and a wider range at a slightly higher price point.

This 29-piece set covers a wide range of holes for metal drilling, consolidating most needs into one organized case. Research indicates it’s a go-to choice for general steel work with a cordless drill, balancing price and performance. The M35 cobalt material is noted as an attractive, more affordable option for this kind of task.

The trade-off is portability. At nearly three pounds and with a case almost a foot long, it’s a bench or shop set, not something for a small bag. For a different approach, the Bosch CO21B is a smaller M42 cobalt set also listed for stainless steel. For most metal drilling, however, Milwaukee’s set delivers proven performance and eliminates hunting for the right size.

Its patented bit-bar design makes each drill bit easy to remove and rearrange, which keeps a busy workspace tidy. The case has a connectable accessory storage system to optimize space, and its small bulk storage size fits inside certain DeWalt ToughCase+ models sold separately. This organization is a major practical advantage for a workshop. Research mentions describe these DeWalt Pilot Point Cobalt bits as versatile and durable, making them a great option for various tasks.

This is a 14-piece set, while other cobalt options like the Milwaukee or IRWIN sets include more pieces. The set prioritizes a storage experience with a clear lid, clip latch, and modular design over a higher piece count. For drilling, the performance is noted as versatile and durable, but the distinctive case is what sets this kit apart on a crowded pegboard.

The 3-flats shank on sizes larger than 3/16-inch is the key feature here, locking the bit firmly in your drill chuck so it won’t slip during heavy drilling. This DEWALT set is built for the DIYer or tradesperson who needs reliable, general-purpose bits for plastic, wood, and most metals. The split-point tip starts cuts cleanly, and the tapered web design means these bits can handle a fair amount of lateral pressure without snapping. It’s a straightforward, durable kit for everyday drilling tasks where you need trusty performance without complication.

High-speed steel is the material, so it’s intended for general use in plastic, wood, and metal rather than specialized alloys. The set contains 14 pieces, which covers common tasks but provides a smaller selection than many 29-piece competitor kits. Its black and gold coating helps prevent rust, and size markings on each shank allow for quick identification.

With 29 bits covering every size from 1/16″ to 1/2″, this set provides the exact hole size needed for common fasteners or fittings. That range makes it a versatile foundation for a home workshop. High-speed steel construction and a black and gold oxide finish offer wear and corrosion resistance for general drilling in wood, plastic, and mild steel.

Standard high-speed steel does not have the heat resistance of cobalt or the abrasion resistance of carbide. Expert round-ups selected Drill America’s M42 cobalt bits for hardened metal and stainless steel, not this high-speed steel set. The 135-degree split point here helps penetrate hard material without a pilot hole, but for repeated work in harsh metals, a more premium alloy is recommended.

A 135-degree split point tip starts holes quickly with less pressure, which reduces walking on slick surfaces like acrylic or steel. Cobalt alloy construction handles the heat generated by drilling hardened metals such as brass. The gold oxide finish and stepped point design are intended for creating or enlarging smoother holes in multiple materials.

This set provides 29 sizes from 1/16 to 1/2 inch, covering most common needs in a single round case. The bits have a jobber length and a 3-flat shank to prevent spinning in the chuck. According to research on other products, Drill America’s carbide bits offer longer life for tougher materials but are more brittle and cost more per bit.

A 5% cobalt alloy formulation gives these bits serious staying power when drilling into hard metals like stainless steel, as it resists the heat that dulls ordinary bits. Their split-point tip geometry starts your hole exactly where you want it, which is critical for precision work. This set is a solid foundation for a home shop or a tradesperson who frequently tackles mixed materials but needs to watch their tool budget. You get a full spectrum of sizes up to a half-inch, ready for everything from pilot holes to final clearance.

The trade-off for that durability and cost is a heavier web construction. That adds strength for tough jobs, but it can sometimes limit chip ejection in very deep, continuous drilling compared to a more aggressively fluted design like the Milwaukee Red Helix. The included case is functional, though its footprint is notably larger than more compact kits like the DEWALT Cobalt set. For the price, you’re investing in the bit material itself, getting cobalt performance where it counts without extra frills.

An impact-rated hex shank allows these bits to handle higher torque from drill/drivers, preventing slippage during demanding work. The design is specifically for heavy-gauge and high-carbon steel, where its long flutes help clear material efficiently. A titanium coating reduces friction during drilling, which can lessen heat buildup for longer bit life. Clear laser markings on each bit help quickly identify the correct diameter on the job.

The trade-off is in versatility. With only nine sizes, you’re covered for common tasks but not for a wide range of precision holes. For a more comprehensive selection for materials like stainless steel, cast iron, or titanium, you’d look at a cobalt set like the Bosch CO21B, which offers more pieces and a different shank design. This Bosch set is a focused solution, built specifically to survive the abuse of impact driving in demanding steel, not to be your only drill bit case.

The 1/4 inch hex shank is the key feature here, locking the bit solidly into an impact driver to prevent cam-out under high torque. That makes this Makita set a logical choice for anyone who primarily uses an impact driver for drilling. The titanium nitride coating promises extended bit life. Its aggressive split-point geometry also helps the bit bite quickly into steel and other tough materials, reducing that frustrating skate across the surface. This is a set built for speed and durability in a driver-centric workflow.

A titanium nitride coating makes these bits last 2.5 times longer than uncoated ones, so they hold their edge through more projects before needing replacement. The 14-piece assortment covers common sizes, offering a more focused range than larger kits like the 29-piece Milwaukee set. Its 135-degree split point geometry helps the bit start faster and reduces wandering on curved surfaces, which is useful for precise hole placement in sheet metal or wood.

A Titanium Nitride coating resists heat and friction, extending cutting edge life up to 6 times that of other high-speed steel bits, so you can drill longer before needing replacements. Its self-centering tip geometry starts drilling immediately with less force, which eliminates ‘walking’ across your work surface for accurate hole placement. Made from premium high-speed steel, this construction prioritizes durability for repeated use.

The core material is high-speed steel, not a cobalt alloy like the Bosch CO21B set uses for stainless steel or titanium. Its 15-piece assortment covers common sizes in a portable case, making it a focused kit rather than a comprehensive collection. This set provides heat management and durability for many drilling applications, but it is not formulated for the hardest alloys.