Description: Suitable for kinds of material engraving and grinding, such as wood, stone, crafts, and etc. 1-3 Speed adjustment, adjust to the speed from 5000-10000-18000RPM for optimal control & performace. 300mAh Lithium batteries, pure copper motor, dual prorection, USB charging port, support quick charging. 20Pcs different polishing bits perfect for carving, polishing, cutting and polishing of multiple materials, and enabling you to achieve different crafting work efficiently. Portable and lightweight design, easy to handle and carry it anywhere. Specification: Material: ABS plastic Clamping range: 2.35mm Collet depth: 25mm Speed: 5000-10000-18000rpm Power: 10w Battery voltage: 4.2V Battery capacity 30OMAH Size Chart: approx. 120x16mm/4.72x0.63inch. Package Includes: 1x Electric Grinding Machine 1x USB cable 20x Grinding Bits Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.