Features: Brand new and high quality Small size, light weight, easy to carry, comfortable grip, better control when drilling, easy to use. This electric engraving tool has stepless speed adjustment, Equipped with 8pcs polishing heads accessories, everything is available. The perfect electric grinder for cutting, engraving, milling, grinding, polishing, removing and drilling. DIY engraving and sanding requires a grinder engraving kits. Suitable for jade agate, nuclear carving, wood carving, grinding aluminum plate, thin copper plate, plastic plate, particle board, printed circuit board, epoxy resin board. Specifications: Material:Aluminium alloy Speed:10000-15000-20000 Clamp:2.35mm Chuck Depth:25mm Electric Voltage:3.7v Power Rate:10w Battery Capacity:380mah Size:Approx.15x129mm/0.59x5.07inches Package Includes: 1 Set Electric Grinding Pen note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.