BG Nexus Black Nickle Double Slave Telephone Socket NBNBTS2 with 35mm Steel Back BoxBG Nexus Black Nickle Double Slave Telephone Socket NBNBTS2 with 35mm Steel Back Box This double secondary telephone socket from British General uses a screw terminal connection and should be used for additional telephone points which feed from the master telephone socket. This black nickel finish socket has a sleek and slim profile, with softly rounded edges to add a touch of luxury to your dcor. The 35mm steel back box is designed for flush wall