A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-608-5300
NSN 6145-00-494-2847
NSN 6685-00-753-7668
NSN 5975-01-469-2510
NSN 6105-01-395-4596
NSN 5999-00-036-8454
NSN 4140-00-856-8115
NSN 6240-00-922-7919
NSN 6145-01-441-4239
NSN 5950-01-021-5615
NSN 5925-01-526-4755
NSN 6110-01-340-9424