This is made from 316 stainless steel with 1.8mm holes to allow for the heat to escape while creating a faraday cage which reduces most of the harmful radiation created.
Size internally - 335mm x 245mm Size externally - 346mm x 257mm
This will be able to fit most Modems/Routers easily.
Easy to connect, simply pull the wires off your device, put them through the black hole, then connect them back up with the device placed within the cage, then put the cover on!