【FUNCTIONAL VERSATILE】 The scriber etchers of AODOOR electric micro engraving pen can drilling holes, grinding, graving and others. Also there are other 6 different style polishing heads with sanding ring. And other 8 unique Stencils suit all your needs from fine lines to deep grooves witch that can helps you polish and complete any engraving more quickly and easily. 【STEPLESS SPEED】 From 3,000 to 20,000 RPM (revolutions per minute). AODOOR micro carving combo set can be used for engraving, polishing wood , metal , leather, glass, nail, pet manicure, etc. Usually, low speed for metal and wood, fast speed for glass and ceramic. 【DURABLE & RELIABLE】 AODOOR adjustable rotating speed carve tool is quite Lightweight and has compact design, witch is easy to complete complex work, suitable for engraving personal marks to identify other people's marks. You can also engrave for protection against theft. 【LIGHTWEIGHT & EASY TO USE】 Turn on ON/OFF AODOOR mini diy engraving tool kit switch of the engraver pen. Slide the switch to find the speed you needed. And then just holds it like holding a pen, making you easily control the engraving/drawing path. 【Safety Reminder】 Please read the instruction manual and safety instructions carefully before use AODOOR electric micro engraving pen. Kids under 16 years old is not allow to use alone. Adult supervision required. If you have any other questions, inbox us anytime.