Shelter Adjustable Single Flue Chimney Cap for Large Flue is crafted from durable 24-gauge single-piece galvanized steel, ensuring long-lasting protection for your chimney. It features an 18-gauge 3/4" expanded galvanized steel mesh that effectively keeps out birds, squirrels, leaves, and debris, while the black powder-coated paint finish adds a sleek look and extra weather resistance. The stainless steel mounting brackets provide sturdy support, and installation is quick and easy with just a screwdriver. This versatile cap fits multiple flue tile sizes, including 13" x 13", 13" x 18", 9" x 18", 12" x 16", as well as several oval sizes like 8" x 17", 10" x 17", and 13" x 17". It protects your flue from moisture and helps maintain the efficiency and safety of your chimney system.