Irwin Masonry Drill Bit Set (5-Pieces)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. Quick change shank is designed to work with impact drivers, and reduces slipping in standard drill chucks. Set includes (1) 5 32', (2) 3 16', (2) 1 4' bits.