... -2008 certification 4)strict quality control 5)OEM&ODM aluminum extrusion heat sinks1)Material: aluminum alloy2)Workmanship: aluminum die casting3)Application ... , Powder coating, Anodic oxidation, Electrophoretic coating, grainy transfer.5.Aluminum extrusion process: Drilling, Cutting, Stamping, Milling. 6. The product quality is ...