... Meterial:AL 6063 6061/T5/T6 availablesize: 300*136.5mm1 Process of heat sink:precision cutting, drilling, skiving,deburring,fine blanking,soldering,bonding ... , stamping,milling, CNC machining,polishing2 Surface finish for heat sink:clear anodizing, oxidation process, powder coating, brushing, sandblasting,shot blasting,polishing,milling3 ...