These lightweight high precision tools in a pen style design (Ø only 35mm (1.4")) are ergonomically formed to allow comfortable handling and optimal control. Their quietness and effortless, vibration-free drive via the special permanent magnet motor, the ground spindle and collar bearing all contribute to the ergonomic design. An efficient cooling system facilitates extended use under various load conditions. Both tools are useable on any workable material e.g. steel, precious metals, wood, glass, ceramics, plastics, precious stones. They are ideal for model builders, woodcarvers, jewelers, opticians, artists, dental technicians, tool and die makers, etc. A specially balanced motor makes this tool run very smoothly at variable speeds from 5,000 - 20,000rpm (no load). It comes with 6 high precision triple slit steel collets in sizes 1 - 1.5 - 2 - 2.4 - 3 and 3.2mm (1/32" - 1/16" - 5/64" - 3/32" - 7/64" and 1/8") which ensure accurate clamping of the bits for highest concentricity and the precision you need for finest work pieces. Weight: 230g (1.2 lbs), length: 220mm (8 21/32"). Low voltage for optimal safety, 12V DC, max 40W input.