Features: This electric engraving pen set includes high-performances and low-noise rotary tool for fine DIY work. Suitable for carving, sanding, grinding, polishing, or cutting on metal, wood, glass,plastic,etc. 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,plastic carving,etc. The engraving pen is lightweight and ergonomically designed to give you precise control and engraving; This metal engraving machine works with low noise, so do not worry about disturbing others. Specifications: Material:Aluminum Alloy Color:Pink,Gray,Black,Blue,(Optional) Size:Approx.12.1x1.6cm/4.76x0.63inch Clamp Diameter: 2.35mm Voltage:3.7V Speed: 5000RPM-10000RPM-20000RPM Battery capacity: 500MAH Power:10W Package Includes: 1xElectric Engraving Pen note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.