Steel, fed.Spec. Qq-s-633 fs1040 through fs1050, 5.000 in. Lg, 0.309 in. Dia. 1st. Step, 3.000 in. Lg. 1st. Step, 1.094 in dia. 2nd. Step, 0.250 in. Lg 2nd. Step, 1.370 in. Diameter 3rd. Step, 1.750 in. Lg 3rd. Step, phosphate coat finish, c35 min. C40 max. Rockwell hardness