Features 1、The speed range of the electric miniature engraving pen is 5000‑10000‑18000 three levels (revolutions per minute) 2、Can easily control the engraving/drawing way. Generally, the speed of metal and wood is lower, and the speed of glass and ceramics is faster 3、You can hold easily and comfortably, just like a pen, you can perform complex tasks without excessive pressure on your wrist or hand 4、This DIY vibration carving tool set is suitable for metal, glass, nails, plastic, wood, leather, etc. 5、Aluminum alloy material with light weight, good strength and corrosion resistance Specification Item Type: Electric Micro Engraver Pen Material: Aluminum alloy Adapt to Grinding Head Shank Diameter: Approx. 3mm / 0.1in Chuck Depth: Approx. 25mm / 1in Speed: 5000-10000-18000 three levels Power: 10W Battery Voltage: 4.2V Battery Capacity: 300mAh Battery Type: Lithium battery Use Time: Three levels no-load operation for more than 1 hour, if you need to use for a long time, you can use it while charging. Charging: 80% can be charged in 30 minutes, fully charged in 60 minutes. Charging Port: TYPE-C is the same as the charging port for Android smartphones. Package List 1 x Main Body 10 x Matte Sheet 36 x Grinding Needle 5 x Sponge 1 x Hex Wrench