Material alum alloy 6061-t4 per qq-a-250/11 (sm1870-26) 0.125 thk; finish chromate chemical film per mil-c-5541 cl1a, paint black per sd1037-05-36, (fed-std-595) color no. 37038; ref designations marked per sb1198-72-08; dimensions in inches- 8.690 long, 6.000 to 6.020 wide