Use this drill bit sharpener with a standard bench grinder for fast and accurate sharpening of HSS drills The Draper 44351 drill grinder attachment is designed to be used in conjunction with standard bench grinders for fast and accurate sharpening of HSS twist drills 3-9mm in diameter. It has pre-set notches at 41° (countersink), 49°, 59°, 68° and 88°. Features: Designed to be used in conjunction with a standard bench grinder For fast and accurate sharpening of HSS twist drills from 3mm-19mm or 1/8-3/4\" in diameter The diecast body has pre-set notches at 41° (countersink), 49°, 59°, 68° and 88° which cover most tip angle requirements Specification: Net weight: 4kg