This cabinet is designed to surface mount onto a wall. The unit is 120mm deep. It is screwed to the wall from screw fixings in the back. The top and bottom ends can be removed whilst the unit is fitted to ease installation. The top and bottom panels have knock outs that can be used if truncking is being used to bring the cabling to the enclosure. There are also large knock outs in the back to allow for cable entry from the back of the unit.