This is a professional tool for cutting, engraving, milling, grinding, drawing, trimming, polishing, removing anddrilling. It's designed for application of aluminum plate, thin copper board, plastic board, chipboard, printed circuitboard, epoxy board. Features: The grinder engraving kit is necessary for DIY carving and grinding. This electric carving tool has very mini grinder body, convenient to use. Suitable for agate nuclear carving wood carving. For grinding aluminum plate, thin copper board, plastic board, chipboard, printed circuit board, epoxy board. Perfect electric grinder for cutting, engraving, milling, grinding, polishing, removing and drilling. Specifications: Color: Green Speed: 12000 RPM Collet Size: 0.5-3.2mm Frequency: 60hz Type: Drill, Polisher, Cutting Voltage: 12V DC Power: 20W Length of Wire: Approx. 93cm / 36.6in Item Size: Approx. 13.3 * 3.7 * 4cm / 5.2 * 1.5 * 1.6in Item Weight: Approx. 116.8g / 4.1oz (Electric Grinder) Package Size: Approx. 22.7 * 14.5 * 5.5cm / 8.9 * 5.7 * 2.2in Package Weight: Approx. 296g / 10.4oz Package List: 1 * Electric Drill 4 * Polishing Head 2 * Abrasive Disc Cutter 1 * Power Adapter 5 * Drill Bit 5 * Collet