Steel, bar, carbon, fed qq-s-634, grade 1015 to 1025, cold finish, phosphate coated, 4 in o/a lg by 5/8 in. O/a w by 1 in. O/a h, 3/16 in. By 1/4 in. By 45 degree chamfer on one corner, two 5/16 in. Diameter holes with 3/8-16 nc-2b thd spaced 2-7/8 in. C to c along lg and centered on w