"ALUMINUM ALLOY,QQ-A-250/17,ALLOY 7079,T651,125 MICROINCH FINISH,2.410 IN. LG,2.060 IN. W,1.970 IN. H,W/4 HOLES 0.250 IN. MIN,0.252 IN. MAX DIA,SPACED 1.350 IN. BY 0.750 IN. CENTER TO CENTER AND 4 HOLES 0.190 IN. MIN,0.196 IN. MAX DIA,SPACED 1.350 IN. BY 0.870 IN. CENTER TO CENTER"