4material steel qq-s-633 composition c1010-1025, or steel qq-s-681 class 65-35, or steel mil-s-13048 composition c1010-c1025, over-all rectangular in shape, 6.000 in. O/a lg, 2.500 in. O/a w, 1.750 in. O/a thk, 1 ea 1.094 in. Diameter centrally located hole