47mm Galvanised Steel Double Gang Back BoxQTY = 1This listing is also available in packs of 5.Overview - Back boxes are used behind face plates, they allow the face plate to be screwed and secured flush to a wall. The back box itself should be screwed into position. Common face plates which may be used with a back box are light switches, plug sockets, modular systems, etc. Different face plates require different depth back boxes, we stock a full selection. Technical SpecStandard UK sized back boxBrass Earth TerminalsDimensions - 132mm (W) x 72mm (H) x 47mm (D)Standards - ROHS, BS4662.