CONSISTS OF ALUMINUM ALLOY 6061-T4 PER QQ-A-250/11 0.125 IN. THICK WITH CHEMICAL FILM SURFACE TREATMENT PER MIL-C-5541 CLASS 1A; DIMS 6.13 IN. PORM 0.04 IN. LG; 3.94 IN. H; 3.38 IN. W; SLOT IN BOTTOM ACROSS WIDTH 2.625 IN. LG BY 0.250 IN. W WITH NUMBERS 1 THRU 7 EVENLY SPACE ALONG SIDE SLOT; FOUR STUDS ON BOTTOM; INTERNAL SUPPORT ONE END