Alright homeowners, this HY-Guard chimney cap is seriously tough stuff! Made from 100% 304 stainless steel, it's built to withstand seriously harsh weather conditions - even coastal salt air won't phase it. The single bolt-on design makes installation a breeze, fitting right onto your existing clay or masonry flue tiles. It's designed for flue tiles measuring from 11.5x11.5 inches up to 13.5x13.5 inches, so it's pretty versatile. The 24 gauge stainless steel hood with those scalloped corners looks great while the 18 gauge expanded mesh keeps out birds, raccoons, leaves, and rain. Meanwhile, the 16 gauge base flanges and slotted hex-head bolts ensure everything stays securely in place. What's really cool is the outside mounting design gives maximum air space for better draft. Plus, it's made right here in the USA and comes with a limited lifetime warranty. Your chimney will be protected from water damage, animal invasions, and potential fire hazards for years to come!