It is made of 304-grade stainless steel, rust, and corrosion-resistant, sturdy, durable, and long-lasting life. It is Durable, high-quality stainless steel, water resistant, highly polished stainless steel, suitable for bathroom vents and extractors, air conditioning units, kitchen fans, all tumble dryer vent pipes hoses, and so on. Easy to install and use, portable and lightweight, and great for Roofing, soffit vents, yachts, ships, kayaks, etc. Dimensions: 5" x 5”; Thickness: 0.039"; Hose / Cut-out Hole Up to 5" Dia. Package Includes Pack of 1 MARINE CITY 304 Grade Stainless Steel Polished Louvered Vent (Not include four #10 fasteners).