This coupler has female BNC jacks on both ends and is constructed of nickel-plated brass with gold plated contacts. It can be used to join two male BNC plugs or as a gender changer. Connector type: BNC female to BNC female. Adapter is bi-directional and works with all frequencies. Female coax cable to female cable inline splice. Extend BNC cables. CCTV cable standard industry size. Two female BNC connectors, used to connect together RG58 andRG59 and RG6 cables.