A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-164-3675
NSN 5935-00-420-1188
NSN 5975-01-206-1521
NSN 5920-01-320-9357
NSN 6105-01-032-2856
NSN 5835-01-397-8801
NSN 5935-01-316-9659
NSN 5910-00-707-4900
NSN 6685-01-068-4211
NSN 5930-00-799-9635
NSN 5905-01-423-1541
NSN 5996-01-495-0763