IT3000E 3.5 Inch Low Voltage Non-IC Remodel Housing is designed for non insulated remodel applications. Non-IC designation requires that insulation be kept a minimum of 3 inches away from housing. Below ceiling accessible. Takes up to 7/8 inch ceiling thickness. Low voltage 12 volt electronic transformer is included. One 37-50 watt, 12 volt GU5.3 MR16 bulb is required, but not included. Dimmable with a low voltage electronic dimmer. See attached manufacturer dimmer compatibility reference when using LED bulb option. 3 5/8 inch ceiling cut out. 13.3 inch length x 4.6 inch width x 6 inch height. A complete fixture includes a housing and trim, sold separately.