A. USB wireless engraving machine: These engraving tools are equipped with lithium batteries, which can be charged through the USB interface. After being fully charged, wireless use can last for up to 30 minutes. It can help you complete a better engraving process easily. B. The metal engraving pen is equipped with an excellent motor, and the power is up to 25W when working. It has 3 gears with adjustable speed from 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. C. Various grinding heads: These metal engraving machine kits include rotary drill bits, drill bits, and saw blades, all of which are sufficient for engraving, engraving, grinding, polishing, etching, milling, grinding, drilling, and cutting. D. Start the art of carving now: these portable and compact etching pens can be easily carried with you, allowing you to enjoy the easy time of making hand diamond jewelry. It can work on metal, glass, ceramics, leather, wood, jewelry, stone or statues. E. A good choice for beginners: Our metal carving tools are easy to operate and are suitable for beginners.