This electric engraving pen set includes high-performances and low-noise rotary tool for fine work The speed of this engraver tool is about 5000RPM-10000RPM-20000RPM, and different speeds are used to engrave different materials The lowest speed will let you do Jewelry and art works, and also can make you polish your nail in safe, the highest speed can work on wood, glass, carving This metal engraving machine works with low noise, so do not worry about disturbing others The engraving pen is lightweight and ergonomically designed to give you control and engraving Suitable for carving, sanding, grinding, polishing, or cutting on metal, wood, glass, Manufacturer: Tsophreniq