Usable for extended periods when grinding, polishing, cleaning, cutting and engraving. Ideal for mechanics, model builders, jewelers, opticians, artists and electronic enthusiasts. This high-revving motor has full-wave electronic speed control capable of producing variable speeds between 5,000 and 20,000 rpm and is usable for extended periods at a time producing an exceptional power/weight ratio. The streamlined die-cast aluminum head provides a stable housing for the ground steel spindle. It runs in a ball bearing assembly, minimizing play (max. runout 0.001). The tool comes with six high concentricity collets sized 1/32 in., 1/16 in., 5/64 in., 3/32 in., 7/64-inch and 1/8-inch (1.0, 1.5, 2.0, 2.4, 3 and 3.2 mm) along with a collet nut as well as a selection of 34 industrial quality bits and cutters with shanks 3/32-inch (2.3 mm).