Used in electrical wiring, one end of the wire tube connected to one end of the metal hose connection, the size standard is in accordance with British BS4568 standard for metric specifications and conduit specifications matching copper pipes mouth cast brass, no rust, corrosion-resistant, which often require high electrical wiring. packaging is not limited, according to customer requirements. Division I the Bronze Trophy minister cheap, good service, welcome new and old customers to cooperate with us!