The SL439 from ESRs S-Line Range is a 1G standard telephone socket. In a white finish with smooth curved edges, these sockets will blend into any modern building with ease. Offering exceptional quality and value for money, this socket is constructed from a durable plastic, and will fit all standard telephone cables for instant use. This socket is a master telephone socket, designed to conect your home to your service provider, not to be confused with Secondary Sockets for general use around the home. Main Features: Master telephone socket. Durable, scratch resistant thermoset plastic material. Comes complete with fixing screws and screw covers. Complies to all relevant safety standards Technical Specification: Dimensions: Width 85mm x Height 85mm x Depth 13mm Complete fitting and installation of this product may require a 1 Gang 25mm Galvanised Metal Back Box and Flex Cable.