... 10 years supplier 4.SGS,Rohs Hex Machine Screw Nuts — Zinc, CoarseMaterial:stainless steel,steel,copperDia:M2-M20Surface Finish:nickel plated ... ,white zinc,black zinc,color zinc,black oxide,chrome platedMin Order:100000 pcsStandard:JIS,BS ... good manufacturing partner as your need. Hex Machine Screw Nuts - Zinc, Coarse