Miniature Low Voltage, Quick Connect, Remodel Housing - 4 in. Nora Lightings series of 4 inch low voltage remodel housings provides crisp, defined MR16 quartz halogen illumination to any existing drywall ceiling with no above access. Airtight option offers energy savings by reducing the flow of air through the ceiling. A wide variety of attractive adjustable trims allows fine-tuned aiming of direction light sources.