... :zp.black,hdg. 4.iso rohs certificate pop rivet1.various kinds of pop rivet available.2.high quality competive price.3 ... .material of the pop rivet:stainless steel ,carbon steel,Aluminum.brass.4.Surface treatment ... of pop rivet: Zinc-Plating,Nikel-Plating, Chromium-Plating or according requre ...