ISMR7000E35 4.25 Inch Low Voltage IC New Construction Housing is suitable for insulated ceiling applications and damp locations. Below ceiling accessible. Takes up to 7/8 inch ceiling thickness. Low voltage 12 volt electronic transformer included. One 35 watt, 12 volt GU5.3 MR16 bulb is required, but not included. Dimmable with a low voltage electronic dimmer. See attached dimmer compatibility reference when using LED bulb option. Suitable for damp locations. UL listed. 4.3 inch ceiling cut out. 18.25 inch length x 10 inch width x 7.1 inch height. A complete fixture includes a housing and trim, sold separately.