Irwin Tools Irwin Industrial Tools 3046011 2-1/8-Inch 3-Cutter Self Feed Drill Bit, Black

2-1/8" diameter, Speedbor max self feed wood drill bit, 3 times the cutting area & edges of standard self feed bits, 7/16" Hex quick change impact shank fits 1/2" or larger drills, also fits 7/16" Hex impact wrench drills, for drilling large diameter holes in wood, aggressive screw Pitch, precision milled shank eliminates run out & wobble, forged in 1 piece from high carbon steel for max strength under tough drilling conditions, ideal for pipe & conduit systems, Carded.