Description: Regulating Speed-This electric carving tool has 5 speed adjustment,speed adjustment range:3000-15000 r/min. Perfect Grinder - Perfect electric grinder for cutting, engraving, milling, grinding, polishing, removing and drilling. The grinder engraving kit is necessary for DIY carving and grinding. Suitable for jade agate, nuclear carving, wood carving, grinding aluminum plate, thin copper board, plastic board, chipboard, printed circuit board, epoxy board. Durable And Reliable -Small volume, light weight, easily carry, comfort grip handle, offers better control while drilling,convenient to use. Materil: Plastic and Metal. Specification: Power supply voltage 4.2V Input power 10W No-load speed 15000 (rpm) Grinding head diameter 3.0mm Chuck Size: 3.0mm Size Chart: Total Length: 100mm / 3.94inch Package Includes: 1 Piece Engraving Pen 1 Piece Strike Pen 1 Piece USB Cable 1 Piece Flower Template 30 Pieces Bits Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!