Octagon 45" x 18" Unfinished Fire Pit Enclosure. Ready to house a complete 25" drop-in fire pit. Constructed of sturdy 22 guage galvanized steel material, welded frame and a 1/2" HardieBacker board shell. Complete with a cooling vent for the 25" Electronic Ignition Fire Pit. Apply mortar/stone to match your décor and drop in your fire pit kit.