A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-752-0995
NSN 5855-01-396-0258
NSN 5965-00-954-3011
NSN 5999-01-511-5049
NSN 5960-01-359-6630
NSN 2925-01-617-3622
NSN 5960-00-445-3954
NSN 6610-01-186-8798
NSN 5960-01-567-1096
NSN 6110-01-108-2160
NSN 5965-01-502-7006
NSN 5835-00-922-1263