16" x 18" Radiant Fireback Heat Sheilds protect the firebox structural integrity by shielding masonry from 1/3 of the heat that would otherwise cause deterioration. Energy output is also increased by reflecting more heat and light into the room. Instead of cast iron, Stainless steel construction results in a lighter weight and less expensive fire back. The slotted base allows for flexible installation from 65-90 degrees. Four sizes 16 x 18, 20 x 20, 24 x 24 and 27 x 27. Stainless Steel 14 gauge laser cut. Made in the USA.