Expert SelfCut Speed Flat Bits have hex shanks for maximum power transfer in standard three-jaw drills and hexagonal drill driver chucks The Bosch 2608900347 is a Flat Drill Bit with a 20mm diameter, 400mm in length and a 1/4 inch shank. Spade bits are a great accessory for electricians and other installation and building workers. What if they could be even faster and more efficient? With Bosch Tip Technology, they can. Equally at home in softwoods, chipboard or particleboard, the Bosch EXPERT SelfCut Speed Spade Bit offers efficiency and convenience to tradesmen who need to drill through holes or blind holes for cabling, dowels and other hardware installations. suited to rotary drills, rotary impact drills and impact screwdrivers. Features: 3x faster than a standard drill bit Maximum Speed Drilling in Wood Fast drilling is easy with Bosch Tip Technology Self-feeding thread for effortless drilling and speed. Hex shank for maximum power transfer in standard three-jaw drills and hexagonal drill driver chucks Clever wave-shaped spade designed for fast chip removal Specification: Diameter: 20.00mm Total length: 400mm Shank diameter: 1/4 inch Quantity: 1