... 5154 alu alloy 3.Size:4.8x20mm 4.Quality assurance Aluminium blind rivetsType:open end, dome headMaterial: 5050# Aluminium rivet body ... , Steel mandrelSize: 4.8 x 20 mmFinishing: Zinc PlatedPacking ... steel, CopperTypeopen/close end, dome/flat headFinishingZinc plated, polishing, coatedDia.3.2 mm, 4.0 mm, 4.8 mm, 6.4mm ...