Bosch 2608587578 SelfCut Flat Drill Bit with Hex Shank 22mm x 152mm The Bosch 2608587578 is a Flat Wood Drill Bit with a 22mm head size. Designed for drilling soft and hardwood as well as light building materials such as plasterboard. They are manufactured from specially hardened steel with precision ground tips and cutting edges for dimensionally accurate holes and are capable of drilling up to 5x faster than standard spade drill bits. Features: Flat Wood drill bits suitable for Hard Wood, Soft Wood, Plasterboard/Drywall The precision ground tip and cutting edges gives accurate dimensional stability during heavy drilling Drill up to 5 times faster than standard spade drills Innovative self-feeding threaded tip for fast and accurate drilling with little exertion of force Specification: Shank Size: 1/4" Head Size: 22mm Length: 152mm Accessory Fitting Style: Hex Bit Type: Flat Product Material: Steel