Pit Bull CHIAU0600 9-Inch Auger Drill Bit Set, 6-Piece Creates deep, clean holes quickly and cleanly in hard or soft wood Lead screw pulls the bit into the work eliminating extra pressure and strain Use these bits with a hand or electric drill Comes complete with wood case Sizes: 3/8", 15/32", 9/16", 5/8", 11/16", 25/32"