... steel, steel alloyMachining methodTurning, Milling, Drilling, threading, stampling, punching etc..Surface finishPolishing, Chrome plating, zinc plating, blackening, Nickel plating, Electrophoresis, Anodization ... express, 3~5 days door to door service. (Optional)Application Precision instruments, Surgical equipments, Automotive parts, Optical products, LED flash lights, Electronics ...