NB-CTSSPB fits a standard 2 ft. celiing grid pattern and hides all wires and cables, eliminating the need for a ceiling tile kit when using Nigel B. Design's plenum boxes. Comes with NB-PLHK-5 hanging kit. The main advantage is that they replace any standard ceiling mounted plates and are simpler to install and provide a cleaner appearance as all power cables are completely hidden from view.