A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-431-0429
NSN 5910-01-510-4565
NSN 6650-01-155-5217
NSN 6130-01-265-4762
NSN 6220-00-784-5904
NSN 6645-01-542-6159
NSN 6145-01-523-8969
NSN 5945-00-449-1595
NSN 6610-00-527-8892
NSN 6145-01-181-6198
NSN 5920-01-443-0523
NSN 6240-01-062-1684