Zsteel, comp xm-12 per ams5659; heat treat rockwell 35 min to 40 max.; passivate per pn16.04, fscm 99167; first end 2.802 in. Diameter by 0.312 in. Thk by 1.430 id stepped to 1.654 in. Id; second end 1.938 in. Diameter by 0.750 in. Lg by 1.750 in. Id