A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-00-925-0114
NSN 5990-01-386-5561
NSN 5895-01-374-6893
NSN 5835-01-103-7778
NSN 5920-00-422-5517
NSN 6150-01-386-6968
NSN 2925-01-292-9248
NSN 5975-00-827-0261
NSN 4140-01-315-1986
NSN 7035-00-679-9027
NSN 5915-01-254-1087
NSN 5960-00-081-2559