A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-00-241-9099
NSN 6110-01-550-9517
NSN 6110-01-082-2968
NSN 5996-01-446-5097
NSN 5935-00-313-2404
NSN 5835-01-447-2544
NSN 5965-00-518-0958
NSN 5855-01-195-2518
NSN 5945-01-400-2304
NSN 5895-01-487-7132
NSN 2925-01-353-3928
NSN 5925-01-026-9649