TruePower 09-0279 Wood Boring Stubby Auger Bit Set (6 Piece) Make fast, clean holes in both hard and soft woods Lead screw pulls bit into workpiece eliminating extra pressure and strain Short length allows drilling between studs and other tight spaces 1/4" quick-change shank works with drills or impact drivers Includes bit sizes 1/4", 3/8", 1/2", 5/8", 3/4", 1";