A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-00-688-9954
NSN 6220-00-104-9599
NSN 5985-01-252-8164
NSN 5835-01-047-6697
NSN 6650-00-767-6064
NSN 6240-00-491-0517
NSN 5996-00-346-4744
NSN 5999-00-288-3143
NSN 4140-00-473-5768
NSN 6240-01-256-0859
NSN 6220-01-555-8332
NSN 6110-01-091-9703