HY-C SPSS913 ShelterPro Bolt On Single Flue Chimney Cover, Fits Outside Existing Clay Flue Tile Dimensions 9" x 13", Stainless Steel Designed & Engineered to Bolt-On to Existing Clay Flue Tile Fits a square flue size of 7 " x 11 " to 9 " x 13 " Constructed of 100% 304 stainless Steel and built to withstand the toughest conditions 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 Lifetime limited warranty. Made in the USA.