A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-974-4381
NSN 6320-01-185-3857
NSN 5915-00-894-1307
NSN 6145-00-182-9797
NSN 5915-01-258-3813
NSN 5935-00-869-7049
NSN 5895-01-542-5934
NSN 5990-01-284-1595
NSN 5910-01-643-5704
NSN 5905-00-990-8076
NSN 5945-01-443-5357
NSN 6320-00-845-3261