"ALUMINUM ALLOY,QQ-A-250/11,T651; 6.625 IN. FLANGE DIA,6.000 IN. SHOULDER DIA,3.000 IN. CENTER HOLE DIA AND 5.505 IN. COUNTERBORE DIA OPPOSITE END OF THE FLANGE,0.375 IN. FLANGE THICKNESS,0.625 IN. SHOULDER THICKNESS,0.093 IN. COUNTERBORE DEPTH; 6 HOLES EQUALLY SPACED,3 HOLES 0.511 IN. MIN AND 0.515 IN. MAX THRU DIA,3 HOLES 0.529 IN. MIN AND 0.536 IN. MAX THRU DIA AND 1.125 IN. MIN AND 1.135 IN. MAX COUNTERBORE DIA AND 0.656 IN. MIN AND 0.687 IN. MAX COUNTERBORE DEPTH"