Draft King CBC99 Black Galvanized Steel Bolt On Single Flue Chimney Cap for Use in California and Oregon Designed for masonry flue application. Not suitable for metal chimney. Fits outside tile dimensions (inches): 7.5 x 7.5 to 9.5 x 9.5 24 gauge powder-coated galvanized Steel hood with scalloped corners and roll-formed edges, 18 gauge 5/8 inch 100% galvanized Steel expanded metal mesh. Slotted hex-head Steel mounting bolts for easy, durable installation. Outside mounting provides greater free air space Expanded metal mesh turned inward at base allows cover to rest firmly on flue tile, closing any openings to protect against nuisance wildlife. 7 year limited warranty