Universal Replacement Refractory Panel 23.5" high X 27.5 "wide x 1"(+-) thick If your current fireplace firebrick lining has cracks of 1/4" or more, you should replace the panels for safety reason. These replacement fireplace refractory panels are engineered for extreme heat, have excellent thermal properties, and can be used in prefabricated and zero clearance gas or wood burning fireplaces. Panels are 1"(+-) thick, fiber reinforced and can be *cut to fit sizing requirements. They can be used as a left, right, bottom (hearth) or back panel, and are tapered on one edge for a finished look when used as a left or right panel. If one panel does not cover the area you have, you should order multiple panels and cut to fit. *Brick imprint measures 2 1/4" x 7 1/2"