USB wireless engraving machine: These engraving tools are equipped with lithium batteries, which can be charged via the USB interface. After fully charged, wireless use may be idle for up to 30 minutes. Easily help you complete a better engraving process. The metal engraving pen is equipped with an excellent motor and the power can reach 25W when working. 3-speed adjustable speed 5000-25000 rpm, suitable for different occasions. The lowest speed allows you to polish your nails safely, and the highest speed can also be used for metal engraving. Different grinding heads: These metal engraving machine kits include rotary bits, drill bits and saw blades, all of which are sufficient. for engraving, engraving, grinding, polishing, engraving, milling, grinding, drilling and cutting. Start the art of carving now: These portable and compact engraving pens can be easily carried with you, allowing you to enjoy the easy making time. handmade diamond jewelry. It can work on metal, glass, ceramic, leather, wood, jewelry, stone or statues.$Best choice for beginners: Our metal carving tools are easy to use and especially suitable for beginners.