Steel casting, class 105-85, spec qq-s-681.Finish, plating, qq-p-416, type 11, with supplementary chromate treatment: normal color: not bleached orclear, class 2, 0.0003 inch thick, or plating, qq-p-416, type 111, with supplementary phosphate treatment, class 2, 0.0003 inch thick. Length 5.750, width 4.130