Description: Material: ABS Color: Grey/Green/Red Collet diameter: 0.5-3.2mm Rated power input: 10W No-load speed: 5000-15000 rpm Idle time: 2 hours Polishing work time: up to 1 hour Output Voltage: 3.7V / 10A Input voltage: DC 5V USB Packing weight: about 183g Package list: 1*USB drill 1*USB cable (5V DC) 1*Clamp Mandrel 1*rubber wheel 1*Tapping rod 1*Circular saw blade 2*Diamond grinding needle 2*Wool polishing wheel 3*Sandpaper circle 3*Twist drill 5*grinding wheel grinding head 6* Electric drill chuck (0.5mm, 1.0mm, 1.5mm, 2.4mm, 3.0mm, 3.2mm) 1*Storage box Features: 1. Durable and reliable - small size, light weight, easy to carry, comfortable grip, better control when drilling, easy to use. 2. Speed regulation - This electric engraving tool has 3 speed regulation, the speed regulation range: 5000-15000 rpm. 3. Complete Accessories - Equipped with 25 drilling accessories, everything is ready. 4. The Perfect Grinder - The perfect electric grinder for cutting, engraving, milling, grinding, polishing, removing and drilling. The Grinder Engraving Kit is all you need for DIY engraving and grinding. 5. Suitable for jade agate, nuclear carving, wood carving, grinding aluminum plate, thin copper plate, plastic plate, particle board, printed circuit board, epoxy board, etc.