Bosch Self Cut Speed Flat Drill Bit Hex Shank 20mm x 152mm 2608595491 FEATURES Suitable for soft and hard wood, light building stone material and plasterboard Drills three times as fast as standard spade bits Patent pending, self feeding threaded tip and cutting geometry Manufactured in accordance with own factory standards from specially toughened steel Precision ground tip and cutting edges for accurate dimensional stability when drilling Shank with 1/4\" hexagon socket manufactured to DIN 3126 - E 6.3 Innovative self-feeding threaded tip for fast and accurate drilling with little exertion of force Pulls itself through all the way SPECIFICATION Diameter (D): 20.0 mm Total Length (L2): 152 mm