... diameter: 62.75*51.25mm surface treatment:anodizing Extrusion led bulb heat sinkexter diameter: 62.75*51.25mm surface treatment: ... ISO 9001:2008 Certification:AL information:1 Processing of heat sinks precison cutting,drilling, skiving,deburring,fine blanking ... ,punching,stamping,milling,CNC maching,polishing2 Surface treatments for heat sinkclear anodizing, oxidation process, powder coating, brushing, ...