Lightolier 2000LV Low Voltage Standard 3-3/4 Inch Frame-In Kit 120 Volt 12 Volt Lamp MR16 Lytecaster *Trim and light bulb sold separately* Cut Out: 3-11/16" Width: 7-1/2" Length: 11-1/8" Mounting Frame: Galvanized steel. Accommodates all ceilings up to 1" thick. Push-in/twist-out rotoclips hold reflector flush to ceiling