This HY-GUARD Stainless Steel Chimney Cover is the durable and economic choice for all flue types as well as coastal areas. The outside mounting design provides maximum free air space and better draft while the 100% 304 stainless steel construction is built to withstand the toughest conditions. It also helps protect internal metal fireplace fixtures and masonry chimneys from deterioration by keeping out rain, birds, animals, and debris. Made with a 24 gauge stainless steel hood with scalloped corners, 18 gauge 3/4" expanded stainless steel mesh, 16 gauge stainless steel base flanges and slotted hex-head bolts. Limited lifetime warranty. Made in the USA.