The Copper Draft King chimney cover combines the decorative elegance of copper with the durable construction and functionality that are the hallmarks of HY-C Company chimney covers. A 24 gauge 100 Percent copper hood with scalloped corners and roll-formed edges, 18 gauge _ expanded 100 Percent copper mesh, 16 gauge copper-plated stainless steel base and slotted hex-head bolts make this an exceptional cap that will naturally oxidize and develop an attractive patina over time. Lifetime limited warranty. Removable Hood for Easy Cleaning. 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. Fits Outside Tile 16.5 x 16.5 to 18 x 18.