Features 1、Multiple Grinding Heads: The head of this engraving machine has an interchangeable snap on design that allows different grinding heads to be used to create different grinding effects. 2、Adjustable Speed: This engraving machine has an adjustable speed switch to personalize the DIY speed and find the best sanding frequency for you. 3、Electric Engraver: This engraver of ours is made of ABS material as the housing and can be easily used through USB connection. 4、Portable Size: This mini engraving machine is so compact that the engraver can be held in one hand and is light enough to be carried around for use. 5、Product Use: This mini electric engraving machine can be used for 3D printer model grinding and polishing, very practical. Specification Item Type: USB Engraving Machine Material: ABS Package List 1 x Engraving Machine 5 x Grinding Head 1 x Conversion Head 6 x Sandpaper 1 x Instruction 1 x USB Cable