A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-281-7249
NSN 4140-00-356-1979
NSN 5996-01-504-7033
NSN 5996-00-189-6054
NSN 6130-00-878-8376
NSN 6110-00-444-6939
NSN 5996-01-648-0405
NSN 6150-00-849-6555
NSN 5920-01-241-9594
NSN 5990-01-416-1017
NSN 5985-01-434-4908
NSN 5975-00-986-6186