Construction: It is made of Stamped 304 Stainless Steel. It has a Mirror finish, corrosion resistance, and durability for long-term service. Useful Design: It is designed to cover wall or ceiling openings and ducting vents. And to allow a flush surface at the vent area reducing damage to the vent as well as mooring lines, fishing lines and for better airflow control, quiet lever. Easy Use: Easy to install, convenient to use. Suitable for related vents in boats, marine, yachts, caravans, and homes. Dimensions: Width: 115 mm / 4-1/2 inch), Length: 231.8 mm / 9-1/8 inch, Thickness: 0.8 mm /0.03 inch. Package Includes Pack of 2 MARINE CITY Stainless-Steel Rectangle Stamped Louvered Vent for Boat. Here at Marine City Hardware, we specialize in marine hardware products. We are all family and are all working together to bring our customers exactly what they need. Our motto is high quality and taking care of our customers. Everything is double-checked before being sent out to ensure the highest quality.