Features: Easy to connect: 12 X 12 Inches ceiling register is easy and quick to install, making it ideal for DIY enthusiasts or professionals to install a beautiful and fully functional ventilation system that meets daily usage needs. Flush, low-profile design: The flange sits flush against the ceiling for a seamless look. It provides a sturdy base for your vent cover, preventing sagging or shifting over time. Specifications: Material: 22# galvanized steel Color: silver Size: HVAC vent box: 4 inches/ 10.2 cm in height Collar height: 2.5 inches/ 6.4 cm Package includes: 1 Piece 12" x 12" ceiling box Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays