The TOPEX Cordless Rotary Tool offers a variety of different speed gears, 7 gears correspond to different material being worked--1-3: plastics and material with a low melting point, 4-5: stone, ceramics,5: soft wood and metal, 6: hard wood, max: steel. Widely used for drilling, milling, engraving, polishing, cleaning, grinding, cutting of materials such as wood, metal, plastics, ceramics and stone. Whatever you need to sand or drill, this is the perfect choice. A slim ergonomic body provides a 360 degree grip zone for control in any position.