A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-224-7923
NSN 6685-01-186-4838
NSN 6645-00-222-2785
NSN 5915-01-441-7857
NSN 5975-00-082-0894
NSN 5895-00-419-4514
NSN 6130-00-918-6838
NSN 6220-01-371-0387
NSN 6650-00-283-0978
NSN 6685-01-329-1698
NSN 5920-01-151-2773
NSN 4140-01-171-8492