Aluminum alloy ams4218-t6, 7.499 in. Lg, 3.000 in. W, 1.124 in. Thk, 1 hole 0.627 in. Diameter with 0.750 countersink, 1 hole 0.250 in. Diameter with 0.380 in countersink, 2 holes 0.286 in.Dia with 0.562 in. Diameter countersink, 5 holes in edge 0.224 in. Dia