flange lock nut 1.Material:stainless steel,carbon steel 2.free sample ... ,iron,copper,aluminumDia:M5-M20Surface Finish:nickel plated,white zinc,black zinc,color zinc,black oxide,chrome platedMin Order:100,000 pcsStandard:JIS ... sample sample lead time: within days serrated Flange Locking Nuts, Zinc