1、Diamond Coating: Each tool of this file kit is coated with diamond coating, which improves cutting efficiency and wear resistance, and has a long service life. 2、Rust And Corrosion Resistant: Hardened blades with titanium coated surface and thickened nickel plating for rust and corrosion resistance. The grit surface embedded with industrial diamond is suitable for most hard materials. 3、Safe And Harmless: This file kit is made with exquisite craftsmanship, safe and sturdy, harmless to human body, can be used with confidence. 4、Convenience Storage: The file kit is very portable, you can carry it around with you whenever you need it and store it easily when you don't need it. 5、Applicable Scenarios: Our file kit is different from ordinary plastic files and is suitable for cutting harder metals, such as carbide, hardened or carburized tools, alloy steel tools, molds, fixtures, etc.