... .surface: galvanized 4.over ten years supplier serrated Flange Locking Nuts, ZincMaterial:stainless steel,steel,iron,copper,aluminumDia:M5-M20Surface Finish ... :nickel plated,white zinc,black zinc,color zinc,black oxide,chrome platedMin Order:100,000 pcsStandard:JIS,BS,ISO,DINPacking:carton ... of sample sample lead time: within days serrated Flange Locking Nuts, Zinc