Specifications: Input Voltage: 3.7V; Battery Capactiy: 360mAh Li Battery; Output Power: 30W; Speed: 3500-10500-16000r/min; Clamping Dia.: 0.5-3.2mm((0.5mm, 1.0mm, 1.5mm, 2.4mm, 3.2mm)); Size: Approx. 160x30mm; Perfect For: Sanding, grinding, polishing, deburring, engraving, dust removing, drilling and more; Applicable to stainless steel, porcelain, stone, glass, plastic, wood, bracelet, etc. Features: 3 SPEEDS ADJUSTMENT- One button to switch rotation speed from 3500-10500-16000r/min, which let you set and adjust speed flexibly according to the work contents and the type of materials being used. Spindle lock makes for quick and easy bit changes. LIGHTWEIGHT & HOLD ONE-HANDED- This rotary tool weighs about 0.035 lb. It held like a pen for precision work, held like a hammer for rough work, makes you work better and less fatigue. WITH 24PCS ROTARY TOOLS ACCESSORIES- Suitable for most ferrous and non-ferrous metals, castings, welded joints, rivets, rust, stone, glass, ceramics and porcelain. Sanding drums and sanding disc for rough shaping and smoothing wood and fiberglass. WIDE APPLICATION- Mini rotary tool can be used to cut, grind, grind, carve, polish, engrave, grind, drill, or smooth workpieces for any home improvement or crafting job. So works fine on metal, metal, wood, plastic, modeling clay, jewelry, aluminum. The multifunction tool grinder can also be used to care for the claws of pets. Do not be overused with hard materials. Package included (Total 25PCS): 1 x Green Rotary Tool Machine; 5 x Brass Collets(0.5mm, 1.0mm, 1.5mm, 2.4mm, 3.2mm); 5 x Grinding Bits; 4 x Drill Bits; 3 x Conneting Rods; 3 x Sanding Bands; 2 x Polishing Heads; 1 x Cutting Head; 1 x USB Cable.