A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-00-502-5174
NSN 5965-01-201-1580
NSN 6620-01-566-3456
NSN 5905-01-037-2162
NSN 5960-01-204-5820
NSN 5975-00-865-3537
NSN 5895-00-862-5564
NSN 5996-00-189-6054
NSN 6610-01-153-0700
NSN 7035-01-596-3411
NSN 6110-00-269-2696
NSN 5935-01-012-3080