A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-462-2295
NSN 5960-01-371-9143
NSN 5998-00-495-7951
NSN 5998-00-280-2198
NSN
NSN 6150-01-520-4439
NSN 5945-01-263-9269
NSN 5960-01-109-9480
NSN 5945-01-166-3131
NSN 5965-01-472-1997
NSN 5835-01-354-0566
NSN 6685-01-632-2529