Jam-free performance, dual-flute design provides greater speed and control. Optimized for cordless drills in high speed. Rapid Strike tip creates fast, accurate starts and generates less heat for up to 4X longer bit life. Optimized geometry with black oxide coating to cut faster and produce less heat. Laser engraved reference marks can easily be seen while drilling. 3-flat Secure-Grip shank ensures solid connection with the drill chuck to reduce slippage.