"ALUMINUM ALLOY,QQ-A-327,COMP 6061-T6 DIM.,9.750 IN. NOM FLANGE OD,8.000IN. NOM ID,0.580 IN. MIN AND 0.620 IN.MAX O/A BODY HT,0.063 IN. MATERIAL THICKNESS,8.126 IN. NOM OD BENT 45.0 DEG OUTWARD FROM FLANGE BASE W/0.180 IN. CORNER RADIUS,EIGHT MOUNTING HOLES 0.250 NOM DIA EQUALLY SPACED ON 9.000 IN. BOLT CIRCLE DIA RING,USED AS BELLOW RETAINER,WEATHER PROTECTIVE COVER FOR ROTARY WING HEAD CONTROL"