Steel; 0.250 in. Dia; 3.125 in. Lg; hex wrenching feature in center section; 0.437 in. Across flats; 0.188 in. Hex thk; 1st end plain; 0.812 in. From end to hex; 2nd end thd external; 1/4-28 unf 2a rh thd; 0.437 in. Thd lg; 2.125 in. From thd end to hex