A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-00-196-3635
NSN 4140-00-788-2874
NSN 6240-00-021-1296
NSN 5985-00-995-2303
NSN 5945-01-305-4742
NSN 5835-01-524-4731
NSN 5835-01-642-4705
NSN 5935-01-378-6814
NSN 6650-00-287-5868
NSN 5915-01-611-1960
NSN 6110-01-305-5590
NSN 6110-01-034-1687