Metal Socket Box Flush mounted For use with double switches 2 Gang Size: 35mm Powermaster 2 Gang 35Mm Flush Metal Double Socket Box | 1799-04 The Powermaster Flush Metal Box - 35mm 2 Gang is a metal box. It is flush mounted and can be used on double sockets or switches such as a 2 gang cooker switch, as it is the medium depth surface mounted box. The pack contains one 2 gang pattress box and has hassle free, easy to open polyurethane packaging. It requires standard installation tools and should only be installed by a competent, qualified person. It conforms to BS standard 5733.