Standard:DIN, ANSI, BSW, JSB, ISO Certificate:ISO, ROHS, SGS Material:stainless steel, steel, aluminum Grade:4.6-12.9, A2, A4 Surface treatment:Plain, black finished, Zinc plated (Galv), Hot Dip Galvanized Size:M2-M16 or cusomized Length:7.5-24mm or as request Features:Good anti-corrosion ability. high strength Service:OEM, ODM