"Bought these to fit some USB double sockets which are deeper than usual but also used for standard sockets and the extra space is useful to make the job easer. Just make sure there is space in the wall to fit them."
"These dry linig boxes are great value. Actually I have installed them in wood panelled walls 12mm thick. Same principle though as dry wall or plaster board (whatever you want to call it). I have fitted 18 of these in a cabin / studio for various purposes and they do the job. Easy fitting, nuff said!
I also used these to fit double gang accessory facias (for Studio cabling), and OK the access for the cables was a bit tight, but this is not a normal use for these... For the mains plug sockets they were perfectly fine!"