IRWIN 1870546 Masonry Bit Impact Drill Bit, 3-3/4 in L Flute, Hex Shank, 1/4 in Dia Shank

Innovative pressed carbide tip with aggressive cutting angles for faster drilling and longer bit life. One-piece construction withstands higher torque loads than standard quick change bits. Black oxide finish resists corrosion and increases life of bit. 1/4 in quick change shank is designed to work with impact drivers and reduces slipping in standard drill chucks.