Mini Wirele Drill Electric Carving Pen Variable Speed USB Cordle Drill Rotary Tools Kit Engraver Pen for Grinding Polishing Speed :15000r/minClamp:0.5-3.2mmVoltage: 3.7VCharge:USBSupport wholesale productsIf you open a tool shop, a supermarket and other sellers, and purchase more than 10 items at a time, please contact me and I will give you a lower priceWe have our own factory, and support large order Rechargeable Lithium BatteryUniversal USB Interface Rechargeable via supplied compatible USB connector at any place, more conveniente for your charging. Full charging time is about 2 hours and can be used about 90 minutes. All copper thick wall chuck chuck Easy replacement of acceorie Accurate and durable without dropping the drill bit, capable of quickly replacing the chuck to meet different needs.Clamping range: 0.5-3.2mm 3 Rotation Speed 3 Rotation Speed controled by one button - 6000/9000/15000 rpm, shows clearly with three red light on the tool body. It can meet different tasks against your needs. Charging/plugging dual purpose interface Charging/plug-in design, fast disaembly and easy storage Comfortable body More comfortable touch. Small and light. Easy to carry