Designed primarily for brick and block work applications. They can be used for the round sockets from our porcelain range. Each box will join to the next with a dovetail connecting spacer. Please find the spacers in the Back Box section of the website. It's easy to overlook this product. They come highly recommended for a consistent onsite installation. Diameter of wall hole required at 80mm for installation. Made from self-extinguishing PVC (fire reaction class A1 – F). Designed for 400V, 16A. Temperature resistance: -5 + 60 °C. Diameter 74mm x Inlets 7 x 20mm Please allow 10 working days for delivery. Please note, some images may include our Dyke & Dean logo as a watermark which does not appear on the product itself and that some colours and finishes may vary due to screen calibration.