IRWIN Tools 1888627 Impact Performance Series Concrete Screw Drill-Drive Installation Set for 3/16-Inch Screws,  4-Piece Built for maximum durability and long life with impact drivers 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" quick-change shank is designed to work with impact drivers, and reduces slipping in standard drill chucks