"MATERIAL ALUMINUM ALLOY 5052; TEMPER H32 SPEC QQ-A-250/8; THICKNESS 0.900 IN. NOMINAL OVERALL; PROTECTIVE FINISH CHEMICAL FILM PER MIL-C-5541,CLASS1A,PRIME PER SPEC TT-P-1757,TOPCOAT COLOR WHITE PER SPEC TT-E-489; OVERALL NOMINAL DIMENSIONS AT EXTREMITIES 21.000 IN. LENGTH BY 21.190 IN. WIDTH BY 24.280 IN. HEIGHT; WELD IN ACCORDANCE WITH CLASS A,SPEC MIL-W-45205"