Insert material is corrosion resistant steel, qq-s-766, no. 1, finish type301 or 302 1/2 hard temper; 1 coat zinc chromate primer, mil-p-8585; 1 coat paint, tt-e-529, color no. X-2408 (olive drab) of fed-std-595; 17.370 in. Lg.; 13.950 in. W.; 0.730 in. High