A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-339-2805
NSN 6620-00-033-3280
NSN 6145-01-124-2124
NSN 5945-01-633-9134
NSN 5960-01-227-5245
NSN 5905-01-347-1040
NSN 6110-01-119-3949
NSN 5996-00-854-3311
NSN 5930-00-446-9125
NSN 5905-01-528-7879
NSN 2925-01-111-2927
NSN 5930-00-050-0416