Mandrex ULTIMATE SpeedXbit Flat Wood Bit 152mm x 25mmExtreme fast drilling of holes compared to conventional flat spade drill bits. Our unique self-feeding threaded QuickTip Technology enables the drill bit to effortless pull itself into the wood. Precision grounded cutting edges for faster drilling and longer life time and a black oxide finish for more durability.Suitable for use on soft and hard wood, light building materials and plasterboard. This spade bit has a 1/4-inch hex shank and can be used in electric battery powered & cordless power tools,including impact drivers.FEATURES Widest range of wood & wooden materials Extremely fast because of the self-feeding QuickTiptm technology Cutting depth 152 or 406mm Hex 1/4” powerbit shank Highest grade hardened steel cutting edges Suitable for use in electric & battery powered tools