1. And Reliable -Small volume, light weight, easily carry, comfort grip handle, offers better control while drilling., convenient to use. 2. Regulating Speed-This electric carving tool has 3 speed adjustment,speed adjustment range:5000/10000/15000 r/min. 3. 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. 4. Suitable for jade , nuclear carving, wood carving, grinding aluminum plate, thin copper board, plastic board, chipboard, printed circuit board, epoxy board. For Safe Use: 1. When you finish using the unit, switch off the motor and that all moving parts have come to a complete standstill. 2. Before using additional accessories not included in this set, always compare the maximum allowed RPM of that specific accessory with the RPM of this tool. 3. In case o electrical or mechanical malfunction, immediately switch off the tool. 4. Do not activate