9material aluminum, anodize per mil-p-8625 type ii class 2 dyed black, and cres passivated finish, lg o/a 5.060 in., w o/a 3.020 in., 2 drilled holes 0.257 in. Dia, equally spaced apart 3.960 in., 2 each spring pins 0.094 in. Dia, 2 ea flat washers 0.250 in.