Zsteel, cold finished, s.A.E. 1018, cadmium irridite finish, 4 ea 0.266 in. Diameter through holes, 4 ea equally spaced 1/4-20 tap through holes, 2.188 in. Major dia, @0.875 in. Id, 2.500 in. O/a dia, 3.250 in. O/a lg, 2.250 in o/a w, 0.500 in. O/a h