A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-389-2170
NSN 6610-01-012-4081
NSN 5925-01-423-0079
NSN 5920-01-216-1981
NSN 5910-01-193-8368
NSN 5935-01-328-8552
NSN 5905-01-463-8665
NSN 5999-01-599-3180
NSN 6110-00-762-9128
NSN 5975-01-398-0197
NSN 7035-00-205-8739
NSN 5905-00-828-1214