FeaturesDetachable medium base porcelain socket with nickel plated copper screw shellVertically adjustable to accommodate up to a 1-1/4 in ceiling thicknessSteel housing is fully assembled for ease of installationThermally protected against improper use of lamps or insulationPre-wired junction box with (5) 1/2 in and (1) 3/4 in knockouts with pryout slots, (4) non-metallic sheathed cable connectors and ground wireShadow-free, knife edge trim design blends smoothly into the ceilingUL listed, cUL, CSA certified for through branch wiring, maximum (8) 12 AWG minimum 90 deg C branch circuit conductorsReal Nail® 3 bar hangers telescoping system with pre-installed removable nail for repositioning and integral T-bar mounting feature for suspended ceilingsReal Nail® 3 bar hangers feature patented break away bars for tight joist spacingIf installed where insulation is present, the insulation must be pulled back 3 in from all sides of the TC housing22 ga die-formed galvanized steel mounting frameHousing is vertically adjustable to accommodate up to a 1-1/4 in ceiling thicknessR14/R16/R20/PAR16/PAR20 lamps