Built-in overload protection chip. When the resistance is too high, the cordless engraving pen automatically power off, preventing machine damage and extending service life.Made of solid metal, the exterior metal wrap gives you a better metal texture instead of a cheap plastic texture that 't discolor or fall off during use. The cordless electric engraving pen has a rotation speed of up to 20,000 rpm, and 3 different speeds (short ) to engrave different materials.This engraving pen is and designed with ergonomic design, allowing you to precisely control and engrave. Cordless Rotary Engraving Tool is very light and portable during short trips.The work sounds were very low and even quiet laughter that would not be interrupted even by others in the room.(Smart power outage protection protect beginners from safe use. This tool is recommended for adults.) engraving machine kit includes: 1 X engraving pen, 1 X USB Type-C charging cable, 1 X polished drill, 2 X drill, 3 X saw and 1 connecting rod, 30 X engraving drill, 5 X template.All of these drills are sufficient for engraving, engraving, grinding, polishing, , planing, grinding, drilling, cutting, and more. Colour: A Silver Material:Metal Package Contents: 1 set x engraving pen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.