Steel qq-s-636 condition 2 through 5, 0.120 in. Thk, 75.000 in.Lg, 6.750 in. W, 0.750 in. Diameter mtg holes, perpendicular flange on one side 71.500 in. Lg, 1.750 in. W, 12 slotted holes 0.437 in. W by 0.875 in. Lg, angle plate welded to opposite side 75.000 in. Lg, 1.500 in. W, 2.000 in. H