Elite Lighting Round universal housing of size 6 Inch comes in die-formed aluminum construction for maximum heat dissipation/rust protection. Housing is furnished with preinstalled adjustable bar hangers for advanced protection. It is ideal for 2 Inch x 8 Inch joist construction applications. Housing is compatible with AF631, AF649, AF630, AF651 and AF637 trims. Housing comes with junction box that includes four 1/2 Inch knockouts, one 3/4 Inch knockout and four Romex knockouts. It measures 24 Inch x 7 Inch x 7-1/4 Inch. It adjusts vertically in plaster frame to accounts diameterate 1/2 to 1-3/8 Inch ceiling. It includes medium base screw shell porcelain socket that attaches directly to the AF series trims. It features preinstalled bar hangers allow locking system at any point within a 24 Inch joist span. Housing with bar hangers contain a double-headed real nail for 20 degree downward angle for better contact. It also includes 90 degree pivoting mounting plate that makes installation fast and accurate. Housing fits onto T-Bar spline with additional slots and holes for special mounting methouter diameters. Housing contains special screw on the frame that locks bar hangers and prevents the housing from any movement once installed. It admits loose socket and quick connectors. Housing is cULus and ETL listed.