Sales Force Disc 2001,Bosch SF2001 2 In. Self-Feed Drill Bit,Bosch,SF2001" /> 7/16 In. hex shank for reduced slippage (3 In. and larger three-flat shank) Chip lifters and spurs can be re-sharpened to maximize bit life Deep cutter gullets prevent stalling and provide smoother drilling Replaceable threaded tip and hex key included