... zinc-platingMaterialBrass, Carton steel, Stainless steel, Alloy steelSurface TreatmentChrome plating, Silver plating, Zinc plating, Nickel plating, Tin-plating, Passivate, Oxidation, ... recess type, H drive, Hexagon socket, Square socket, Torx, Triangle drive, Indented hexagon and etc.Certificates:ISO 9001:2008 and ... suitable for your products.www.jielimetal.com.cn Custom Brass Round Nut JL-SCR-026