wire connector,electric connectors crust made of nylon, long copper inside spread the scope of wire interface wire connector,electric connectorscrust ... of nylon, long copper inside spread the scope of wire interfaceCrust material: Nylon 66 approved by UL, fireproof ... wire away, insert it into the connector, pushed down by clamp tool YAC-6Certificates: UL, CE, CSA,CCC wire connector,electric connectors ...