Halo 4" Recessed AIR-TIGHT New Construction Housing, 5-1/2" H, 4-1/2" Opening Rated For Non-Insulated Ceilings, For Use In 2" x 6" Construction, Integral Thermal Protector, Junction Box Listed For Through Circuit Wiring, 4 Each 1/2" KOs, 4 Each Romex KOs, Pry Out Slots & Strain Relief, Pre-Installed Nailless Captive Bar Hangers To 24" Joist Span, Fit To T-Bar Spline, Hangers Repositioned To 90°ree Without Tools, UL, CSA, Damp Locations, IP Rated.