Designed to hide a swing arm mount in the wall, taking installations from low profile to no profile! Compatible with the PNRIW, PWRIW, MWRIW swing arms. Features: Large conduit knockouts for easier cable integration Includes a RACO-style single junction electrical box Saves installation time when used with a pre-assembled Chief in-wall swing arm Takes a Chief on-wall arm and makes it in-wall for the ultimate flush appearance Weight capacity: 200 lbs (90.7 kg)