... qulity and perfect finish on surface. Metal Screw is made by one of the CY hareware manufacturer : 1) 8years ... satisfactory process service with very competitive price. Stamping parts - Iorn , brass, S.steel,aluminum Precision forging / ... brass, gray iron,3.Process: investment casting, die casting, gravity casting, sand casting4.Machining: turning, milling, drilling, grinding, threading ...