Features 1、Electric Engraver: This engraver of ours is made of ABS material as the housing and can be easily used through USB connection. 2、Speed Adjustment: The engraving pen is equipped with a speed control switch. The speed is from 3000 to 20000 to suit different situations. Maximum speed can be used for metal engraving. 3、Complete Accessories: These engraving machine kit include 5 grinding bits, 1 conversion head, 6 sandpaper, these tools are used for engraving, sanding, polishing, etching, grinding, cutting. 4、Wide Uses: 3D printer model grinding and polishing interchangeable buckle design, can use different grinding process. It can work on metal, glass, ceramic, leather, wood,jewelry,stone or statue. 5、Easy to Carry: This portable and compact etching pen is convience to take anywhere you want and allow you enjoy relaxing model polishing making time. Specification Item Type: USB Rechargable Engraving Machine Material: ABS Package List 1 x Sanding Machine 5 x Grinding Bits 1 x Conversion Head 6 x Sandpapers 1 x Instruction Manual 1 x USB Cable