A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-358-8069
NSN 5975-00-596-2119
NSN 6650-00-896-6758
NSN 6105-00-161-1834
NSN 6240-00-316-3167
NSN 5945-00-629-8974
NSN 5960-01-499-3544
NSN 2925-01-032-3814
NSN 5925-01-657-6068
NSN 5960-01-122-1101
NSN 5975-00-212-7754
NSN 5835-00-614-0650