Assembly of, 1 plate, matl 6061-t6 al aly per specification qq-a-250/11 /sm1870-27/ with chromate chemical film per mil-c-5541, class 1a, p/n 162406-21, 2 nuts, self-locking, clinch, p/n 138067-08, 3 fasteners, turnlock, p/n 142943-01, 4 nuts, self-locking, spline, p/n 142943-01, assembly is 3.000 in. Lg, 2.000 in. W o/a