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Speedbor Max Self-Feed Wood Drill Bit, 1-3/8-In.

Irwin

1-3/8" 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.