Use this model with bench grinders to sharpen your existing drill bits The Sealey SMS01 Drill Bit Sharpener Grinding Attachment is ideal for use with any standard bench grinder. It provides quick and precise sharpening of 3-19mm HSS twist drill bits and features a rotating neck which aids in grinding both sides of the drill bit. Features: Ideal for use with any standard bench grinder Provides quick and precise sharpening of 3-19mm (1/8-3/4\") HSS twist drill bits Features an angle gauge with pre-sets at 41° (Countersink), 49°, 59°, 68° and 88° Also features a rotating neck which aids in grinding both sides of the drill bit Specification: Angle Adjustment: 41° (Countersink), 49°, 59°, 68°, 88° Minimum Drill Bit Length: 75mm Nett Weight: 0.29Kg Sizes: 3-19mm(1/8-3/4\")