"MATL ALUMINUM ALLOY,2024-T351; FINISH CHEMICAL FILM,MIL-C-5541; 0.350 IN. O/A DIA; 0.080 IN. O/A THK; ONE 0.062 IN. DIA HOLE THRU CENTRALLY LOCATED; TWO 0.067 IN. DIA HOLES THRU WITH COUNTERSINK TO 0.135 IN. DIA IRREGULARLY SPACED; ONE 0.094 IN. DIA HOLE THRU IRREGULARLY SPACED"