Matl al aly 6061 tem t6 per qq-a-250/11; finish silver plate per collins 580-0065-00; ring shaped; dimension 4.315 in. Outside diam, 3.562 in. Inside diam by 0.375 in. Wide; 6 mtg holes 0.125 in. Diam spaced 60 deg, 6 mtg holes 0.203 in. Diam spaced 60 deg
