Flush Mounting Box for Grid Switch Panels. This box is for flush mounting grid switches. Accepts all leading brands 6 or 8 gang plates. BS4662. Flush box used for mounting 6 or 8 gang grid switch assemblies. Product may be substituted for alternative direct equivalent box, e.g. MK, Crabtree etc. All of these boxes are of uniform size and accommodate similar grid configurations from all brands. Dimensions: 133mm wide x 133mm x 40mm deep. Fixing Centres 122mm horizontally. 62 mm vertically.