Universal Chimney Caps fit a huge variety of flue tiles. From round and oval to square and rectangle flue tiles. This cap features very effective mounting system that grabs the inside of the flue. A great mounting option for when the flue tiles don't extend above the chimney crown. It's 5/8" spark arrestor animal proof mesh conforms to California codes. Available in five stock sizes. Also available in copper. Please email us for a price quote. Custom sizes are not available in this model chimney cap. Made in the USA.