A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-322-5537
NSN 5855-00-797-8217
NSN 6610-01-364-0294
NSN 5835-00-310-6807
NSN 5960-01-375-6815
NSN 5996-00-222-6049
NSN 6110-01-339-9977
NSN 4140-01-360-5134
NSN 5855-01-042-7990
NSN 5985-01-322-8546
NSN 5855-00-149-0766
NSN 5920-01-178-8139