+ISO9001:2008 CE RoHS for OEM Sheet Metal Steel Box +Provide OEM service Specification: ShenZhen YongPingTong ... punching, stamping,milling, CNC machining,polishing 2 surface treaments for heat sink clear anodizing, oxidation process, powder coating, ... specialized in sheet metal producsts since 2007. Any question, please feel free to contact us. OEM Sheet Metal Steel Box. distribution box. metal box