SHOCKWAVE™ Impact Duty™ step bits are engineered to deliver the most durable and fastest impact step bit hole drilling solution. Our step drill bits are made in the USA with global materials and give you best-in-class performance in impact drivers with the versatility to be used in drills. The 1/4 in hex shank has an optimized ShockZone™ body providing you with the industries most durable shank, reducing early shank breaks. A titanium aluminum nitride (TiAlN) coating helps deliver you 5X longer life, while the step drill bits Rapid Strike™ tip and dual spiral flute produce 2X faster holes. Our 1/8 to 1/2 in step bit features 13 steps with laser engraving for a clear stop on size identification. Milwaukee® SHOCKWAVE™ Impact Duty™ Step Drill Bit, Impact, 3/16 in Diameter Minimum Hole, 7/8 in Diameter Maximum Hole, 3-37/64 in Overall Length, 1.949 in Cutting Depth, 12 Steps, 12 Hole, 2 Flutes, Dual Spiral Flute, 1.949 in Flute Length, 1/4 in Shank, Hex Shank, Rapid Strike Tip Point, Titanium, TiAlN Coated, Applicable Materials: Iron, Steel, Aluminum, Brass, Copper and Wood