Our 16" Square Tray & Grate has 3/8" wide steel bars. Measures 16" square overall. Fits our #918 furnace.  Uniquely designed, this two-part, steel oven tray has an upper rack for holding flasks during burnout and allows melted wax to collect in the lower tray. Keeps your furnace floor clean.  After wax has melted out of flasks, remove the stainless steel tray to prevent the release of irritating fumes that are produced when wax burns. Your flasks remain undisturbed, and your heating elements will last longer.