"ALUMINUM ALLOY QQ-A-225/6 2024-T351,2.500 IN. SQ,0.780 IN. THK,ONE HOLE IN CENTER 0.218 IN. MIN 0.224 IN. MAX DIA THRU PORT PER MS33649-04 EXCEPT TAP DRILL DEPTH TO BE 0.590 AND FULLTHD DEPTH TO BE 0.46-0.50,FOUR HOLES EQUALLY SPACED 0.218/0.224 IN. DIA"