1. USB wireless engraving machine: These engraving tools are equipped with lithium batteries, which can be charged through the USB interface. Up to 30 minutes of cordless use on a full charge. Easily help you achieve a better engraving process. 2. The metal engraving pen is equipped with an excellent motor, and the power is up to 25W when working. 3 gears adjustable speed 5000-25000 rpm, suitable for different occasions. The lowest speed allows you to safely sand your nails, and the highest speed can also be used for metal carving. 3. Various Grinding Bits: These metal engraving machine kits include rotary drill bits, drill bits and saw blades, which are enough for engraving, engraving, grinding, polishing, etching, milling, grinding, drilling and cutting. 4. Start carving art right away: These portable and compact etching pens can be easily carried anywhere, allowing you to enjoy a relaxing time making handmade diamond jewelry. It works on metal, glass, ceramic, leather, wood, jewelry, stone or statue. 5. Best choice for beginners: Our metal carving tools are easy to operate, especially for beginners.