Bosch Expert Self Cut Speed Flat Drill Bit Hex Shank 20mm x 400mm 2608900347 Suitable for softwoods, chipboard or particleboard. Drills up to three times as fast as standard spade bits.  FEATURES Offers efficiency and convenience to tradesmen who need to drill through holes or blind holes for cabling, dowels and other hardware installations Self-feeding thread for effortless drilling and speed Clever wave-shaped spade designed for fast chip removal Hex shank for maximum power transfer in standard three-jaw drills and hexagonal drill driver chucks SPECIFICATION Diameter (D): 20 mm Total Length (L2): 400 mm