Construction: It is made of Stainless Steel. It has a Mirror finish, corrosion resistance, and durability for long-term service. It is specifically designed to allow a flush surface at the vent area, reducing the damage to the vent as well as mooring lines, fishing lines, etc. Mirror finish, corrosion resistance, and durability, convenient to use. Suitable for related vents in boats, marine, yachts, caravans, and homes. Dimensions: Slots: 4, Length: 8-1/8 inches, Width: 4-7/16 inches, Height: 1-1/2 inches. Great for roofing, soffit vents, yachts, etc. Easy to install and remove for maintenance and work. Package Includes 1 Pcs of MARINE CITY Stainless Steel 3 Slots Louvered Vent for boats.