Bosch Self Cut Speed Flat Spade Drill Bit Set Hex Shank x6 Pcs 2608595425 6 Piece spade bit set self cut set including 13, 16, 19, 20, 22 and 25mm flat bits for wood. CONTENTS Diameter (D) (mm): 13.0 / 16.0 / 19.0 / 20.0 / 22.0 / 25.0 Canvas wrap FEATURES Shaped spade for fast chip removal 6 Piece set New cutting geometry for clean and accurate drilling Innovative self-feeding threaded tip for fast and accurate drilling with little exertion of force Suitable for soft and hard wood, light building materials and plasterboard Drills ten times faster than a standard spade bit The drill bit pulls itself into the wood effortlessly and extremely quickly due to its self-feeding threaded tip Bosch patented Manufactured in accordance with own factory standards from specially toughened steel 1/4\" hex shank manufactured to ISO 1173 E6.3