... machine ,lathing machine ,turning maching,wire cut machine and so on 2.Material :aluminum, mild steel, ... nylon, delrin, arcylic and so on. 3.Surface treatment:hardening, carburizing, high frequency, anodizing, clear anodizing,black anodizing ,chrome plating, black ... oxide coating, nickel plating, zinc plating, nitriding, degreasing, painting and so on ...