A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-00-205-0620
NSN 5950-01-556-3064
NSN 5950-00-890-9775
NSN 5996-00-549-4258
NSN 5895-00-270-6595
NSN 6220-01-634-0660
NSN 5895-01-112-4714
NSN 6620-00-313-2018
NSN 5915-01-150-5752
NSN 5950-01-547-0043
NSN 5915-01-092-5279
NSN 6110-01-502-0665