Features: - Small volume, light weight, easily carry. - Comfortable grip handle, offers better control while drilling. - The grinder engraving kit is necessary for DIY carving and grinding. - Perfect electric grinder for cutting, engraving, milling, grinding, polishing, removing and drilling. - Suitable for jade agate, nuclear carving, wood carving, grinding aluminum plate, thin copper board, plastic board, chipboard, printed circuit board, epoxy board. Specifications: Size: 90*25mm Rated speed: 8500 (rpm) Material: Aluminium alloy Power supply voltage: 5-6V Package included: 1 x USB Electric Drill 3 x Electric Drill Bit Collets (1.0mm) 1 x Hexagon Screwdriver 1 x USB Cable Notes: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.