... than 20 years experience in fastener feild Name: Red copper coupling ;Copper coupling ; Coupling red copper Ability for the material of this kind of coupling ... the surface finish: ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold plated,chrome(3+Rohs &6+ ) plated,anodic oxidation ... experience for exporting so that you couldavoid lots of risks. Red copper coupling