ARTU Drill Bit, Multi-Purpose, 1/4 in Dia, Flute Type: Parabolic, Flute Length: 2-1/4 in, Shank Type: Quick-Connect, Shank Length: 1-7/8 in, Cutting Edge Material: Cobalt/Tungsten Carbide, Chrome Vanadium Steel, 4-1/8 in OAL, Applicable Materials: Brick, Cast Metal, Ceramic Tiles, Concrete, Fiberglass, Glass, Granite, Hardened Steel, Hardwood, Marble, Masonry, Plexiglas, PVC, Softwood, Package Type: Carded, Suitable for: Cordless Drills, Corded Drills, Drill Presses