Chim-A-Lator 420808 8" x 8" Black Galvanized Steel California Chimney Cap. The Chim-A-Lator® line of chimney caps easily mount to the top of a masonry fireplace with a simple screwdriver. Our premium stainless steel caps are made of 100% type 304 stainless steel for lifetime protection against rust and corrosion. All of Our caps are constructed of 18 gauge expanded metal screen and a 16 gauge frame. Our galvanized caps are coated with a high quality black powder coat finish to assure long lasting beauty.