... screws,machine screw,hard disk screws,self tapping screw,nylock patch screw,waterproof sealing screws,color head screw and precision ... such as hard disk screw, self tapping screw, patch screw, water-proof sealing screw, head colored screw, special use screw as well as precision ... shafts and pins and other fastening parts.We do all the manufacturing process, such as forming ...