IRWIN 1871043 Impact Drill Bit Impact Drill Bit, Spiral Flute, 3-1/2 in L Flute, Hex Shank, 1/4 in Dia Shank

One-piece construction withstands higher torque loads than standard quick-change bits. Exclusive TurboMax tip minimizes walking and delivers faster starts and stays sharp longer. Made from premium high speed steel with black oxide finish for added corrosion resistance. 1/4 in quick-change shank is designed to work with impact drivers and reduces slipping in standard drill chucks.