This spade bit features a 1/4-inch hex shank system and is ideal for use with portable power drills. The Bosch Expert SelfCut Speed Spade Bit ensures extremely fast hole drilling. Its self-feeding threaded tip allows the drill bit to pull itself into the wood effortlessly, enabling high-speed drilling with minimal exertion. The specially shaped spade facilitates rapid chip removal for quick results. In product tests, this drill bit drills holes 10 times faster than standard spade bits. It is suitable for soft and hard wood, light building materials, and plasterboard. Features include high-speed drilling in wood, Bosch Tip Technology for easy fast drilling, a self-feeding thread for effortless, high-speed drilling, and a 1/4" Hex shank for compatibility with three-jaw and hexagonal drill driver chucks. Drill Bit Size Metric: 40mm, Overall Length: 152mm.