Milwaukee® SHOCKWAVE™ Impact Duty™ Step Drill Bit, Impact, 1/8 in Diameter Minimum Hole, 1/2 in Diameter Maximum Hole, 3-3/34 in Overall Length, 2.112 in Cutting Depth, 13 Steps, 13 Hole, 2 Flutes, Dual Spiral Flute, 2.112 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