... 20 years experience in fastener feild Name: Red copper coupling with gap; Red copper coupling ; Coupling with gap Ability for the material of this ... finish: ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold plated,chrome(3+Rohs &6+ ) plated,anodic oxidation,etcDip platingblack ...