Steel; 1.375 in. Od; 0.315 in. Lg; single hub 0.750 in. Od by 0.125 in. Hub lg; 0.590 in. Id; bearing surface opposite the hub end is beveled 1.375 in. Major diameter by 1.000 in. Minor dia; 0.250 in. Lg of bevel; beveled surface has 24 evenly spaced notches