Halo, 4", Recessed Air Tight New Construction Housing, 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 Non-Metallic 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 Degree Without Tools, 5-1/2"H, 4-1/2" Opening ,UL, CSA, Damp Locations, IP Rated, UPC Bulk.