4", Remodel Recessed Housing, Air Tight, For Use With Non-Insulated Ceilings Or If Insulated Insulation Must Be 3" Away, 4 Remodel Clips Secure Housing & Accommodates 1/2" & 5/8" Ceiling Thickness, 5 H" Fits 2" x 6" Joist Construction, Adjustable Porcelain Socket, Integral Thermal Protector, 7 Junction Box Conduit Knockouts Are Uniform 1/2" Size With True Pryout Slots, 4 Pryouts With Integral Strain Relief For Non-Metallic Sheathed Cable, 3 Push In Wire Connectors For Easier Installation, 4-1/4" Opening, 120V, Compatible With Halo 4" Trims, UL/CUL Listed For Damp Location.