Stainless Steel pop rivet Flat head counter sunk flange All stainless steel body and mandrel Size 2.4 ... , 3.2, 3.5 up to 6.4mm Stainless Steel ... flange or large flangeMaterial OptionsHead/MandrelAuminium/AluminumAluminium/Steel 5050, 5052, 5055Steel/SteelAll Stainless SteelSteel Color OptionsPlain, black, grey, ... (3/16-5/8 inch) Stainless Steel Pop Rivet