Specification:Material: Carbon Steel, DiamondFinish: Nickel PlatingFile Type: RoundDiameter: 7mm-10mmFile Length: 300mm / 11.81inchTotal Length: 410mm / 16.14inch Package Content:1 x Diamond File Description:1. Made of carbon steel, heated with diamond coated and nickel plating for long-lasting durability, wear resistance and high strength.2. With the plastic handle, are comfortable for handling and long-term use..3. Application for all kinds of , model, parts and components, crafts and other industries. Such as jade, porcelain, glass, crystal, metal, harden alloy and other components. Suitable for grinding, polishing, engraving, cutting, drilling, etc.