Steel, qq-s-634, 1015 through 1035, cd, and steel, qq-s-00640, fs1020, t3, cr. Special shape, 3.312 in. O/a width, 3.031 in. O/a lg. Two slots 0.843 in. Lg, 0.270 in. Wide. Four 0.177 in. Diameter mtg holes with 0.343 in. C/bore by 0.286 in. Max depth. Left-hand application.