For sale is a Pair of Steel Plates. (1) 12-1/4" X 8-1/4" X 1" Plate. (1) 8-1/2" X 4-15/16" X 1" Plate. 40 Pounds net weight. I do not know the type / grade of steel from which these pieces were made. NOTE: The larger plate has two corners that are fairly chewed-up (see photographs). The top and bottom surfaces of both plates are flat and in good condition.