... ,soldering,bonding, punching, stamping,milling, CNC machining,polishing 2 surface treaments for heat sink clear anodizing, oxidation process, powder coating ... , brushing, sandblasting,shot blasting,polishing,milling 3 Surface color: natrual ,black,matt black, green, red,yellow,silver, ... please feel free to contact us. OEM Sheet Metal Steel Box. distribution box. metal box