Durability, longevity and impressive performance combine in this 3-Piece Step Drill Bit Set (48-89-9221) from Milwaukee. The dual-flute design provides greater speed and control along with jam-free performance. For use with cordless drills in high speed, it offers up to 2 times faster performance than competing brands. It also boasts optimized geometry with black oxide coating to cut faster, produce less heat and last up to 4 times longer than standard drill bits.