... 10 years supplier 4.SGS,Rohs Hex Machine Screw Nuts — 18-8 Stainless Steel, CoarseMaterial:stainless steel,steel,copperDia:M2-M20Surface ... Black Anodize,Plain,Chrome plated,Hot Deep Galvanize(H. D. G. ) etc.Heat TreatmentTempering,Hardening,Spheroidizing,Stress Relieving.StandardISO,GB, ... our goods will satisfy yr request of 100%,and have 18 month warranty.Aftersales servicewe will follow up goods for ...