NW3000LE 3.5 Inch 42-50 Watt GU5.3 MR16 Halogen Non-IC Long New Construction Housing with electronic transformer is made of 18 gauge galvanized steel. Non-IC designation requires that insulation be kept a minimum of 3 inches away from housing. Below ceiling accessible. Can fit in ceilings up to 7/8 inch thick. Includes 12 volt electronic transformer. One 42-50 watt, 12 volt GU5.3 MR16 bulb is required, but not included. Wattage determined by trim/housing combination. Dimmable with a low voltage electronic dimmer. See attached manufacturer dimmer compatibility reference when using LED bulb option. Suitable for damp locations. UL listed. Ceiling cutout 3 5/8 inch. 15.38 inch length x 7.3 inch width x 5.5 inch height. A complete fixture includes a housing and trim, sold separately.