A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-204-8677
NSN 5999-00-232-4479
NSN 5930-01-577-2804
NSN 4140-01-234-8170
NSN 5905-00-406-1421
NSN 5915-00-884-4773
NSN 5965-01-648-3736
NSN 6320-01-384-3850
NSN 5999-01-476-2466
NSN 5990-01-431-3725
NSN 5950-00-414-7857
NSN 4140-01-167-7574