... blanking,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 ... +power delivery 4U Rackmount Chassis with Front-accessible SATA HDD Trays for Easy Maintenance