Steel qq-s-681 cl 150-125; cadmium plate qq-p-416 type 2 cl 2; 3.968 in. Lg; 4.500 in. Od; counterbored 1st end twice, 3.504 in. Diameter 0.468 in. Lg and3.375 in. Diameter 0.625 in. Lg; bore 2.505 in. Dia, 2.875 in. Lg, 0.125 microinch finish, has 2 keyways 180 degrees apart 0.281 in. Wide