Abstract: An improved polished rod for use in pumping a well has the characteristics of reducing inventory and warehouse space requirements. The polished rod is in the form of an elongated high strength cylindrical metal rod of uniform external diameter and adaptable for reciprocation in an oil well stuffing box, the exterior surface being adaptable to receive a clamp thereon by which the polished rod is reciprocated, and the polished rod having male threaded end portions at opposed first and second ends, either of which may be employed for threadable attachment to a female threaded upper end of a string of sucker rods suspended in a well. The first end portion having a thread of a first size for attachment to a sucker rod string having a female thread of mating size and the second end having a thread of a different, second size for attachment to a sucker rod string having a female thread of different, mating size whereby the polished rod may be employed for use with two different sizes of sucker rod strings.