Anodize per mil-a-8625, type 1, class1; 4.000 in. Ht, 2.470 in. Wd; 1st end bore 0.500 in. Dia, 2nd end counterbored 0.650 in., 0.060in. Dp, bore center 2.750 in. From bottom; includes 2 threaded helical coil inserts 0.250-28unf, center holes for inserts 1.000 in. Apart