The Stainless Steel Stackable Multi-Pack chimney cap by HY-C Company is constructed of 100% 304 stainless steel and built to withstand the toughest of conditions. It's ideal for oil, coal, heavy wood burners, or any chimney application within 25 miles of a saltwater coast. Our high-quality construction includes a 24-gauge stainless steel hood with scalloped corners and roll-formed edges, an 18-gauge 3/4" expanded stainless steel mesh, and a 16-gauge stainless steel base for extra strength. The four-pack carton saves valuable storage space and decreases shipping costs. Using pointed stainless steel slotted hex-head bolts, our side-mounting installation design provides an extremely secure fit to any masonry flue tile. These stainless steel chimney caps are made in the USA and backed by HY-C's Lifetime Limited Warranty.