Product selling points:1. Comfortable grip, well-designed carving pen allows you to use it as a pencil for a comfortable feel, better control, and precise carving.2. Reliable quality made of high-strength metal and selected electronic components, with wear resistance, wear resistance, and long service life.3. High efficiency. The speed of this carving pen is as high as 5000-15000r/min, and the carving effect is efficient. It is adjustable in three levels, making carving easier.4. USB rechargeable engraving pen, electric engraving can be charged and used. Battery capacity 700MAH5. Wide application range: The pen can be used for carving metal, ceramics, wood, pebbles, plastics, etc., suitable for DIY projects or proce purposes. Parameters:Name: USB rechargeable electric grinding pen, three speed grinding machine, micro engraving machineVoltage: 3.6VLithium battery capacity: 700MASpeed regulation: 3 speed regulationIdle speed: 5000-10000-15000 rpmChuck size: 2.35MM 3.0MMSingle unit weight: 0.2kg/0.4KGSingle packaging size: 20 * 14 * 4CMProduct usage range: nuclear carving, egg carving, jade, jade polishing, polishing, DIY handmade, etc Package 1 includes:32 piece USB rechargeable electric grinding pen set Package 2 includes134 piece USB rechargeable electric grinding pen set Package 3 includes30 grinding needles be careful:Due to the differences between different displays, the images may not reflect the actual color of the item. We guarantee that the style is the same as shown in the picture.2. Due to differences in manual measurements, please allow for slight size differences.