Metal Socket Box Flush mounted For use with double switches 2 Gang Size: 25mm Powermaster 2 Gang 25Mm Flush Metal Double Socket Box | 1523-20 The Powermaster Flush Metal Box - 25mm 2 Gang is a metal box. It is flush mounted and can be used on double sockets or switches such as a 2 gang 2 way switched socket, as it is the medium depth flush 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.