A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-246-4314
NSN 5990-00-910-0027
NSN 5999-01-180-3909
NSN 5920-01-026-2559
NSN 5960-01-027-8833
NSN 5835-01-466-5496
NSN 5835-00-987-9341
NSN 6610-01-359-9962
NSN 5935-01-625-5086
NSN 6240-01-421-4025
NSN 5950-01-579-7064
NSN 5855-00-058-1293