Baffle trim for 4" inside diameter housings. Easy-to-install with mounting hardware, instructions included. IC (insulation contact) and NON-IC rated. UL (United Laboratories) listed. For use with Thomas Brand Model No. PS4, PS4RM, TR4, TRR4, and TR4ASIC. Uses 1 R 20 or Par 20 50W maximum bulb. Can also be used with R 20 and Par 20 LED (light emitting diode) and CFL (compact fluorescent) bulbs. 7.5" H X 6.75" D.