Copper cover long what kind Copper cover long what kind A cylindrical hollow, a head with a lid, the lid center embedding (porcelain porcelain eye eye is to protect the copper wire used to cross the line when the copper cover) if the lack of the porcelain eye, wire, copper wire to wire cover and friction, which not only hurt the line, also hurt the line cover. We understand the details please visit the company's official website: www.www.swlawyer.org.cn Source: www.www.swlawyer.org.cn (forward please specify forwarding source)