A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-176-5426
NSN 5999-01-552-5374
NSN 5996-01-042-3421
NSN 6145-01-271-9650
NSN 5990-01-272-4091
NSN 5998-00-056-9239
NSN 5960-01-356-4429
NSN 5915-00-170-6775
NSN 6240-00-776-1614
NSN 5835-01-227-2318
NSN 5996-01-192-8606
NSN 6220-01-543-6073