This IC rated double wall aluminum housing is AIR-TITE with a supplied gasket. For new construction housing, it prevents airflow between heated or air conditioned spaces and unconditioned attic areas. Socket for 120V GU10 halogen lamps. Fits 2" x 8" joist construction. From Halo. Aluminum construction. Socket for 120V GU10 halogen lamps. Fits 2" x 8" joist construction.