Ceiling Thickness: Ceiling thickness varies from 5/8' - 1-1/4'. WSEC ASTM E283 for Air-Tight. Width: 96 Length: 12.625 Height: 96 Ceiling OpeningDiameter: 4.375? Safety certification: UL (Underwriter's Laboratory) listed Height: 44″ Wt. 3 lbs. Pairs with: All 1/2″ Sq. balusters Shoes: 16.3.19, 16.3.2 The 16.1.21 long single twist iron baluster features a 22″ twist. This baluster is solid wrought iron and is 1/2″ square Nora NSL-401AT/10 4 Inch 50 Watt/120V GU10 Airtight Housing - Lighting... NHIC-27LMRAT - Nora Lighting Minimum Clearances: “IC” Housing is direct contact rated; no minimum clearance is required. Power supply required: 120 volts Nora Square Trim Nora NSLIC-401AT/10 4" IC Air-Tight Line Voltage MR16 Nora 4 Inch Can Trims Bar Hangers: Bar hangers are adjustable from 13-5/8' to 24-1/2' and can be repositioned 90 degrees. Electrical: Quick connect provided. Rated for direct contact with thermal insulation, Nora’s 4' IC housing is quick to install, accepts a wide variety of high quality trims, and is airtight built for energy savings. Air-tight construction provides energy savings by reducing the flow of air through the ceiling. Lamp Adjustment: Socket mounting plate allows slight adjustment to fine tune for best possible light distribution.