Aluminum alloy, fed qq-a-250/11, alloy 6061, tepmer 0, enamel olive drab, 0.040 to 0.060 in. Thk material, 9.980 in. Peripheral diameter by 3.120 in. Cross sectional h, 6.900 in. Center hole dia, 7 in. Od by 1.870 in. Recess depth flange, six 1.140 in. Diameter mtg holes on 8.500 in. Bolt circle dia