Steel; body 3.690 in. Od; inside chamfer 52 degrees by 0.375 in.; flange one end 5.560 in. Od, 0.560 in. Thk, with two groove underside; outer groove 5.125 in. Od 1/4 in. W, 0.344 in. Deep; inner groove 4.188 in. Od, 0.250 in. W, 0.344 in. Deep; top 4.500 in. Od, 45 degrees angle, 0.250 in. H