The DEWALT 3-Piece Impact Ready Step Drill Bit Set (DWA1790IR) is optimized for use with impact drivers, but also delivers maximum performance when used in rotary drill drivers. These bits can be used in a variety of applications such as drilling into cans and junction boxes, enlarging holes in ducts, and installing door hardware. They feature an advanced double spiral flute design and a split point tip for increased speed and durability. The measurements are laser engraved on each bit for increased step visibility.