Power strips to be installed in a rack but can also be used independently. They have metal tabs that can be mounted external of the terminal sockets for the installation of the power strip in a rack. Failure to install these metal tabs, is a conventional power strip to be used anywhere. Strips made of extruded aluminum and Bakelite sockets highest quality. Family strips of different features, but with width of 19" for vertical or horizontal installation in a cabinet of 19 " .