Greenlee® Kwik Stepper® Step Bit, Multi-Hole, Imperial, #5 Letter/Wire, 3/16 in Diameter Minimum Hole, 7/8 in Diameter Maximum Hole, 3-7/16 in Overall Length, 3/8 in Cutting Depth, 11 Steps, 11 Hole, 2 Flutes, Split Point, Steel, Oxide Coated, Applicable Materials: Aluminum, Brass, Copper, Laminates, Mild Steel, Plastic and Wood