For drilling large diameter holes in wood for pipe, conduit, and other applications. Precision-milled shank eliminates runout and wobble. Replaceable screw tip. 3 times the cutting edges extends bit life. Resharpenable edges. 7/16″ hex quick change impact shank fits 1/2″ or larger electric drills or 7/16″ hex impact wrench drill. 1 per card.