This chrome plated 12V outlet is a great convenience when installed inside your trailer. It allows you to easily plug in 12 volt appliances with standard cigarette lighter type plugs. The receptacle mounting plate measures 2-3/4 x 4-1/2, which is the size of a household outlet or light switch plate. It requires a 1-3/4" deep recess in the cabinet or wall it is installed in. Comes complete with adapter ring, ground wire and terminal lug.