This Bosch spade bit features a 1/4-inch hex shank system, ideal for use with portable power drills. The Self-Cut Speed Spade Bit offers exceptionally fast hole drilling. Its self-feeding threaded tip allows the drill bit to easily pull itself into wood, enabling high-speed drilling with minimal effort. Specially shaped spades facilitate 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.