19-piece metal twist drill bit and bit set. High quality metal twist drill bits for precise drilling in metal. Made out of high speed steel (HSS). A finely-tuned material elasticity provides for great durability. Very good concentricity. The hexagonal shaft ensures very good power transfer. Tough viscous bits for universal use. Drive: ¼" hexagon, suitable for holders as per DIN ISO 1173-D 6.3. Includes robust belt pouch for secure storage.