USB wireless engraving machine: This type of engraving tool is equipped with a lithium battery that can be charged through the USB interface. When fully charged, wireless use can last up to 30 minutes of idle time. Easily help you complete a better engraving process. $The metal engraving pen is equipped with an excellent motor with a working power of up to 25W. 3 levels of adjustable speed from 5,000 to 25,000 rpm, suitable for different occasions. The lowest speed allows you to safely polish your nails, and the highest speed can also be used for metal engraving. $ Various Grinding Bits: These metal engraving machine sets include rotary drill bits, drill bits and saw blades, which are enough for engraving, engraving, grinding, polishing, etching, milling, grinding, drilling and cutting. $ START THE ART OF ENGLING NOW: These portable and compact etching pens can be easily taken anywhere, allowing you to enjoy a relaxing time making hand diamond jewelry. It can work on metal, glass, ceramics, leather, wood, jewelry, stone or statues. $BEST CHOICE FOR BEGINNERS: Our metal engraving tools are easy to operate, especially suitable for beginners.