A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-132-5139
NSN 5990-01-458-1621
NSN 5999-00-157-4435
NSN 5835-01-018-6294
NSN 2925-01-191-5814
NSN 6135-00-803-3012
NSN 6650-01-494-9956
NSN 5920-00-518-1793
NSN 5996-01-050-6910
NSN 5835-00-850-1475
NSN 6150-00-927-1860
NSN 5835-01-455-3380