Jam-free performance: dual-flute design optimized for cordless drills in high speed provides greater speed and control Rapid strike tip: creates fast, accurate starts and generates less heat Laser-engraved reference marks: easily stop on any whole size 3-flat secure-grip shank: reduces bit slippage in the chuck Includes one 48-89-9201 Milwaukee 1 step bit 1/8 in. to 1/2 in. one 48-89-9202 Milwaukee 2-step bit 3/16 in. to 1/2 in. one 48-89-9204 Milwaukee 4 step bit 3/16 in. to 7/8 in. Up to 4 times longer bit life: optimized geometry with black oxide coating to cut faster and produce less heat Up to 2 times faster: optimized for cordless drills in high speed