"ALUMINUM ALLOY,QQ-A-250/4,SQUARE SHAPE,3.120 IN. W,3.120 IN. LGHOLE IN EACH CORNER EQUALLY SPACED ON 3.000 IN. DIA CIRCLE,2 HOLES 0.190IN. MIN,0.196 MAX DIA OFFSET 0.320 IN. FROM CENTER LINE AND 0.500 IN. FROMEDGE,0.249 IN. MIN,0.255 MAX DIA HOLE DRILLED THRU CENTER"