The operation is simple, enabling everybody to sharpen standard 118° HSS, CrV and tungsten bits of 3 - 13 mm diameter professionally. The sharpening operation is controlled exactly by means of the movable carriage. This moves from left to right and also rotates the drill bit on its own axis. This operation yields the correct relief angle. The carriage is fitted with a feed screw for fine feed. A dressing stone, ensuring a sharp cutting surface, is also fitted. Technical Data: Carborundum grinding disc size 50 x 13 mm with 12.7 mm bore, rotating at 8,000 rpm. ABS housing with fixing holes. Super quiet motor for 220 - 240 V operation. Mass 1.7 kg. An easy to understand operating manual and replacement disc accompany the unit.