... , truss, hexagon flange, bugle, wafer, hinge, binding, button, truss3) Surface treatment: kinds of plating (Zinc, Nikel, Chrome, Tin, Ag); Painting, Powder ... , Anodizing, E-coating, Silkscreen, Heat treatment, Black oxid;4) Standard/ specification: OEM service as per customers ... drawings or samples with Quality Gaurantee Stainless Steel screw pem fuel cell screw