... certification. Product introduction : Item NameNon-standard stainless steel flat washer machine gasket Material1.Stainless steel:303/304/316/412/etc2.Aluminum alloy: ... , Baking finish , Anodizing , OxidationOperationCNC machine , Lathe machine , Milling machine , Drilling machine , Planning , Grinding , Boring , Wire-electrode cutting ,and tappingQuality controlProfessional precision manufacture for ...