The 8 Best Step Drill Bits of 2026

The DEWALT DWA1790IR is built around the tool more and more people reach for first: the impact driver. Its 1/4-inch hex shank and impact-ready design mean you can keep one driver on your belt and still drill clean holes in metal studs, brackets, and light sheet metal. The set is compact, with three bits covering 1/8 to 7/8 inch and 31 hole sizes, so it is easy to justify keeping in a small bag.

That focus is exactly why we rate it so highly. The titanium nitride coating and two-flute spiral design are aimed at longer life and better chip removal, and the split point starts holes without skating. In this group, it is the set we trust to keep cutting after the first few holes. It is not the broadest set here, but it is the one we want in an impact-driver kit.

The trade-off is range. Three bits stop at 7/8 inch, so this set will not replace a five-piece kit that reaches 1-3/8 inches, and the premium price buys edge life rather than more sizes. If your work is mostly electrical knockouts, pilot holes, and hardware installation, that is the right trade. If you regularly need a 1-inch or larger hole, start with a five-piece set and add this one for the sizes it does best.

Spiral flutes and hex shanks are the two features that make the SEDIANAS five-piece set stand out from the stack of look-alike step bits. The spiral geometry is designed to pull chips out of the cut instead of packing them into the hole, and the hex shank seats in a quick-change chuck without the bit spinning. With 50 sizes across five bits and a 1/8-to-1-3/8-inch range, it is a lot of coverage for a midrange set. We think it is the best choice here for someone who drills a mix of sheet metal and plastic and wants cleaner chip flow.

The smallest bit in the set starts at 1/8 inch, which is useful for pilot holes, and the range runs up to 1-3/8 inches for larger openings. The bits are titanium-coated HSS with two spiral flutes, and the sizes are printed clearly enough to find the step you need. We like the hex shank for a quick-change drill or impact driver, but check the impact rating before you lean on it in an impact; a hex shank alone does not make a bit impact-ready.

The catch is that this is still a general-purpose set, and the edge life will not match a cobalt bit in repeated use. For light sheet metal, aluminum, wood, and plastic, that is a fair trade at this price. We see it as the set to buy when you want more chip clearance than the budget straight-flute sets provide without paying premium money. The hex shank also makes bit changes faster when you move between a pilot hole and a final size.

The IRONANT set is the least expensive five-piece kit here, and it still gives you 50 hole sizes and an aluminum case. That combination is the reason it belongs on the list: if you need a broad range for occasional work and do not want to spend much, this is the set that gets you there.

The bits are titanium-coated HSS with 3-flat shanks and a 118-degree split point. The case holds each bit in its own slot, and the five bits cover the common sizes for plastic, aluminum, and light sheet metal. We like the case more than the price suggests; it is a sturdy aluminum box, not a throwaway sleeve.

Our verdict is that this is a light-to-medium-duty set, not a daily metalworking tool. Edge life is the weak point: the bits can dull quickly in harder steel, and a slow speed with cutting oil is not optional. If your work is occasional, the low price makes that trade acceptable. If you drill metal every week, spend more on a set with better edge retention and keep this one for plastic and aluminum.

The ZELCAN single bit is the one to keep in a small tool bag when you do not want to carry a whole case. It covers 10 sizes from 1/4 to 1-3/8 inches, with a 3-flat shank and two flutes, so it can enlarge a hole through a range of sizes without a bit change. That is a useful thing to have when you are working away from the bench.

We rate it as the best single bit here for light-duty work. The tri-flat shank grips a standard chuck, and the stepped design lets you creep up on a hole size instead of jumping straight to the final diameter. It is especially handy for plastic, aluminum, and thin sheet metal where you want to open a hole a little at a time.

Sharpness is the catch. This bit loses its edge faster than the premium sets in harder steel, and the larger steps take more patience in thick material. Keep the speed down, use cutting oil, and do not expect production-level life. For occasional use and a compact kit, the convenience is worth it. The single bit is also easier to replace than a whole set when it finally goes dull.

The countersink bits are the reason to choose the AIMLENTOOL set over the other five-piece kits. You get five step bits and five countersinks in one aluminum case, which means the same kit can drill a hole and finish the opening for a flat-head screw. That is a useful combination for DIY furniture, brackets, and light metal fabrication.

The step bits cover 50 sizes from 1/8 to 1-3/8 inches, with titanium nitride coating, a 118-degree split point, and a foam layer in the case to keep everything organized. The countersinks are aimed at 90-degree holes in wood and soft metal. We like the case because it holds the extra bits without turning into a loose pile, and the size markings are easy to read.

Our verdict is that this is a good second kit or a first kit for someone who does both drilling and countersinking. Keep it for aluminum, plastic, and light steel. If you need one case that does two jobs, this is the one to pick. If you only drill metal, put the money into edge life instead of countersinks.

Four spiral flutes and 59 sizes give the Bestwork set a different feel from the two-flute kits that dominate this list. The extra cutting edges are meant to clear chips faster and keep the cut steadier, and the five bits cover 1/8 to 1-3/8 inches. The set lists Rockwell 62-65 hardness, which is a serious claim for a midrange kit.

The bits come with 1/4-inch and 3/8-inch hex shanks, so you can match the shank to the tool you are using. Laser-etched markings make the steps easy to find, and the case keeps the five bits organized. We like the range and the four-flute geometry for sheet metal work where chip packing slows you down.

The trade-off is that a four-flute bit has more cutting edges to dull, and the higher hardness does not guarantee longer life in every material. That does not make it a bad choice; it makes it a choice for someone who wants faster chip clearance and a wider size count without jumping to a premium cobalt set.

Our verdict is that this is the best four-flute set here for a DIYer who drills a lot of sheet metal and wants a broad range in one case. If you mostly drill plastic and light aluminum, the SEDIANAS set is simpler and less expensive. If you need the longest edge life, the premium DEWALT or M2 cobalt set is the better buy.

The M2 cobalt and AlTiN coating are the upgrades that separate this COMOWARE set from the standard five-piece kit. The idea is straightforward: a tougher steel and a harder coating resist heat and wear better when you drill sheet iron or tougher metals. The set covers 1/8 to 1-3/8 inches in five bits and uses four spiral flutes for chip clearance.

The four-flute geometry and the coating are the parts we pay attention to. More flutes can clear chips faster, and the AlTiN coating is listed at 67HRC, which is a hardness claim rather than a promise of performance. The 3/8-inch shank is meant to take more torque than a standard 1/4-inch shank, but it also means you need to check your chuck before ordering.

This is a premium set, and it does not make sense for everyone. If your work is mostly plastic, aluminum, and thin mild steel, the standard COMOWARE set covers the same range for less and the extra cobalt is wasted. The M2 set earns its place when you drill tougher sheet metal regularly and want the extra wear resistance.

Our verdict is that this is the set for the buyer who already knows the standard HSS kit is not holding its edge and wants a tougher bit in the same five-bit range. Check the shank size against your drill, and keep the speed down; cobalt resists heat better, but it still needs cutting oil and a steady hand.