AL ALLOY;ANODIZE PER MIL-A-8625;90 AA MICROINCHES SURFACE ROUGH;4.750 IN. DIA BY 1.500 IN. THK O/A;SEVEN 0.328 IN. DIA HOLES ON THE BASIS OF EIGHT EQUALLY SPACED SPOTFACE 0.750 IN. DIA BY 0.062 RADIUS ON A 4.188 IN. DIA BC;ONE 0.328 IN. DIA HOLE 0.970 IN. FROM CENTER;2.150 IN. DIA MINOR BORE BY 2.440 IN. DIA MAJOR BORE