Features and Benefits:•1/8" Hex for adjusting drill bit length•1/4" Quick Change Hex Shank•Designed for use in Drill DriversThe MILWAUKEE® #6 Countersink features a 9/64" Drill Bit. The pre-drill and countersink bits are designed for use in Milwaukee Drill Drivers. The 1/4" Quick Change Hex Shanks allow for quick size changes. The 1/8" Hex drill bit length is adjustable to allow for precise depth control.