Steel, alloy, fed qq-s-624, composition 6145, 4150, 8650 or 6150, condition a/a, cadmium plated finish, 5/8 in. Thk, 5/8 in. W by 2-11/32 in. O/a lg, 3/8 in. Diameter hole 1st end and two 1/8 in. Diameter by 1/4 in. Deep holes spaced 5/16 in. C to c and 19/32 in. Lg from 2nd end