Irwin Rotary Percussion - Straight Shank 5/16 x 4 L in.

Fits all hammer drills with 3-jaw or Jacobs chuck
Chrome vanadium shaft through-hardened to 50-53HrC
Patented flute geometry removes dust from the hole quicker for fast drilling and long life
Up to 150% faster than other competitive bits
Shot-peened, double-tempered finish reduces breakage
Hot isostatically pressed to extend life and resist breakage
Copper braze material gives high heat resistance for reduced tip loss
All tips made to ANSI specifications