Unibit- Step Drills 0" to 7/8"Sold in sets of 1 Step bits are coated with aluminum titanium nitride and are 10 times more durable than steamed black oxide coating for longer bit life Impact rated shaft allows for use with impact drivers and standard drills Double spiral flute removes chips for faster cuts and drilling Laser markings are easy to read for quick size identification of nine hole sizes Fast starting, non walking drill tip Quick release, 1 4 Inch hex shank provides a