Z0.100 in. Thk aluminum alloy per qq-a-355-t3 (20 24-t3), anodize per mil-a-8625, type 2, dyed black, 2.620 in. O/d, 1.970 in. I/d, three no. 4-40unc-2b holes equally spaced, three 0.156 in. Diameter 100 degrees csk, 0.290 in. Diameter holes equally spaced
