Whether you"re building a new firebox or repairing an existing one, Rutland"s Fire Bricks are up to the task, These bricks can withstand up to 2,700 degrees fahrenheit and meet ASTM C-20, C-16, C-113, C-38, and C-13 standards, Each box contains six firebricks, Suitable for building new fireboxes and repairing existing ones, Can withstand up to 2,700º F, Meets ASTM C-20, C-16, C-113, C-38, and C-133, Box contains six bricks, Approximate brick dimensions: 9"" x 4, 5"" x 1, 25"", SKU: RTLD319