A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-01-535-4004
NSN 5975-01-152-3320
NSN 5985-01-634-0635
NSN 6110-01-149-0690
NSN 6220-00-854-2532
NSN 5835-00-240-9838
NSN 6145-01-444-6917
NSN 5999-01-634-0576
NSN 6650-01-599-1796
NSN 6650-01-421-2762
NSN 5835-01-501-0526
NSN 6110-01-198-8752