Bosch 2607577364 SelfCut Speed Flat Bit Set with Hex Shank (8 Piece) The Bosch 2607577364 is a Flat Drill Bit Set with 8 drills in diameters 12, 16, 18, 20, 22, 25, 28 and 32mm. All pieces are 152mm in length with 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 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: 12/16/18/20/22/25/28/32mm