The Stainless Steel ShelterPro chimney cover by HY-C Company is constructed of 100% 304 stainless steel and built to withstand the toughest conditions. Ideal for oil, coal, or heavy wood burners or for any application within 25 miles of a saltwater coast. High quality construction includes a 24 gauge stainless steel hood with scalloped corners and roll-formed edges, 18 gauge _" expanded stainless steel mesh and 16 gauge stainless steel base. Using slotted hex-head bolts, the unique corner mounting attachment design of a ShelterPro chimney cover provides the securest possible fit to a masonry flue tile. The three most commonly used sizes have lids with cross breaks. Lifetime limited warranty.