USB WIRELESS ENGRAVER: These engraving tool equiped with Lithium battery and rechargable by USB interface. Cordless using will be up to 30 minutes idling after full charge. Easy to help you finish better engraved craft. VARIOUS GRINDING BITS: These metal engraving machine kit include 30pcs rotory bits,2 drill bits, 3 saw blades, all these bits are enough to work on engraving, carving, sanding, polishing, etching, routing, grinding, drilling, cutting. BEGIN ENGRAVED ART NOW: These portable and compact etching pen are convience to take anywhere you want and allow you enjoy relaxing hand drill jewelry making time. It can work on metal, glass, ceramic, leather, wood,jewelry,stone or statue. BEST CHOICE FOR BEGINNER: Our metal engraver tools are easy to operate,special for beginner to use.Create a keychain,DIY a necklace or send gift with our kits. All Products From Us Have Undergone Strict Quality Checks. if There Is Any Quality Problem Or You Are Not Satisfied With The Product contact Us. we Will Give You The Best Solution.