"MATL ALUMINUM,QQ-A-250/8,5052,H32; FINISH CHEM FILM,MIL-C-5541,TYPE II,GRADE C,CLASS 3; 4.438 IN. O/A LG,3.438 IN. O/A W,0.438 IN. O/A THK; FOUR 0.187 IN. DIA HOLES LOCATED 0.218 IN. FROM EACH CORNER THRU; SIX 0.096 IN. DIA HOLES THRU WITH COUNTERBORE TO 0.175 IN. DIA IRREGULARLY SPACED; TWO 0.125 IN. DIA HOLES IRREGULARLY SPACED"