IRWIN 326001 Rotary Hammer Bit Percussion Drill Bit, Twist Flute, 4 in L Flute, Straight Shank, 2 in L Shank         Bit will fit all hammer drills with 3 jaw or Jacobs chuck and features a chrome vanadium shaft through hardened to 50-53HrC, shot-peened, double-tempered finish, flute geometry removes dust from the hole quicker, copper braze material gives high heat resistance. All tips made to ANSI specifications.