... experience in special fastener field 1,Name:Brass female coupling; Brass coupling;Female coupling 2,For the similar coupling,what can we do ?(1), Ability for ... the surface finish: ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold plated,chrome(3+Rohs &6+ ) plated,anodic oxidation,etc ...