USB Wireless Engraving Machine? : These engraving tools are equipped with lithium batteries, which can be charged via the USB interface. After being fully charged, wireless use may be idle for up to 30 minutes. You easily help to 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. : These metal engraving machine kits include rotary drill bits, drill bits, and saw blades, all of which are sufficient. for engraving, engraving, grinding, polishing, engraving, milling, grinding, beading and cutting. A Carving Now: These portable and compact engraving pens can be easily carried with you, allowing you to enjoy the easy time to make. Handmade Diamond Jewelry. It can work on the met...