"ALUM. ALLOY 2024-T4 PER QQ-A-355;FINISH CHROMATE IRIDITE GPS10-030 CAGE 24930;FLANGE 3.500 IN. LG X 2.625 IN. W,4 MTG HOLES 0.221 IN. DIA,BORE DIA 0.900/0.910 IN.,SHANK 0.938 IN. LG X 2.000 IN. OD,1ST COUNTERBORE DIA 1.575 IN.;2ND COUNTERBORE DIA 1.500 IN.;3RD COUNTERBORE DIA 1.000 IN.;4 THDS 0.164-32 UNC-2B,HOLES EQUALLY SPACED ON 3.125 IN. BOLT CIRCLE"