A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-753-5113
NSN 6645-01-571-1234
NSN 5985-00-992-6981
NSN 6130-01-029-8786
NSN 6610-01-534-2147
NSN 6685-01-360-0374
NSN 6645-01-541-9114
NSN 2925-00-246-3077
NSN 5925-00-703-1804
NSN 5990-01-248-0108
NSN 6620-01-595-0024
NSN 6130-01-035-3900