A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-192-2467
NSN 6645-01-076-4655
NSN 5835-00-257-2852
NSN 5910-00-204-9571
NSN 7035-01-381-6185
NSN 6645-01-235-4579
NSN 6110-00-088-8269
NSN 6650-01-534-8357
NSN 6145-01-234-7680
NSN 5910-00-771-9517
NSN 5945-01-612-1804
NSN 6220-00-370-5447