1[Easy To Use] The special multi slot design of the rotary file greatly improves work efficiency, and also can enhanced the machine performance. 2[Scope Of Application] It can be used for woodworking, carving and polishing, chamfering, slotting, reaming, hollowing and chamfering. 3[Wide Range Of Use] It is suitable for wood, steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, marble, bones, etc. 4[Rugged And Durable] It is made of high quality high speed steel, which is not easy to rust and has a long service life, which can be used for a long time. 5[DIY Sanding And Grinding Head Set Accessories] Contain 20 files, which is convenient for carpenters to replace and use. It is very convenient. Item Type: Rotary File Material: High Speed Steel Weight: Approx. 61g / 2.2oz Shank Diameter: Approx. 3mm / 0.1in Scope of application: Woodworking, carving, polishing, etc 20 x Rotary File1. Please allow 1& 8209;2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.