Drill & Screwdriver Bits features: Are you still looking for an electric engraving pen? If so, our electric engraving pen kit is carefully prepared for you. It is mainly used in engraving following materials, such as stone, wood, jade and so on. You deserve to have one set. Feature Color:Grey Material:Plastic Size: Approx.17.50X2.50X2.50cm/6.88X0.98X0.98in.-Clamping Range: 0.5-3.2mm No-load Speed: 3000-15000r/rpm Load Power: 35W Battery Capacity: 2000mAh Charging Method: USB charging.-With lighting, make your work more clear and fine It can be used for beeswax polishing, wood, plastic, jade and other object carvings USB charging design, bring much convenience to you.-The can be adjusted to meet your different work needs Lightweight and portable, more convenient to store and carry.