This is a kind of quality electric grinding machine, compact size, one-hand operation, easy to carry and easy to use. 3-jaw collet design to holds 0.3-3.2mm grinding-head. Multifunction, perfect for engraving cutting polishing drilling use. Works with different grinding heads to fit for more scenarios. Two rechargeable way design, it can be recharged by both 5V powersupply and 3.7V recharge base. You can have a try. Features: Compact size, one-hand operation, easy to carry and easy to use. Stainless steel body, high hardness, with fine durability. The grinding-head can be replaced easily by inserting a wrench into the fixed hole. 3-jaw collet design to holds 0.3-3.2mm grinding-head. Meet the ergonomics design, anti-slip texture for convenient griping. Compass design on the tail, more practical and increase some funky. Using the built-in rotation-axis of the fuselage, with precise three-jaw chuck, effectively p-revent the jitter of the chuck, clamping stability will not drop, the drilling and grinding process with higher concentricity. Multifunction, perfect for engraving cutting polishing drilling use. Works with different grinding heads to fit for more scenarios. Suitable for engraving wood, egg, cutting wood piece, drilling holes, grinding wood, metal, polishing wood, metal, plastics and etc.. Two rechargeable way design, it can be recharged by both 5V powersupply and 3.7V recharge base. Solid wood storage box for easy storage and also prevents missing accessories. Specifications: Name: Electric Grinding Machine Material: stainless steel+plastics Battery: 2 * 18650 battery, 3.7V, 1500mAh (included) Clamping-range: 0.3-3.2mm Rotation speed: 18000r/min Output voltage: 3.7V Item size: 27 * 27 * 200mm / 1.06 * 1.06 * 7.87in Item weight: 55g / 1.94ounce Package size: 195 * 100 * 47mm / 7.68 * 3.94 * 1.85in Package weight: 285g / 10.05ounce Packing List: 1 * Electric Grinding Machine 2 * 18650 Battery 1 * 3.7V Rechargeable Base