A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-226-1235
NSN 5960-00-179-4749
NSN 5998-01-461-3506
NSN 6610-01-067-6591
NSN 6650-00-130-0847
NSN 2925-00-435-5604
NSN 5999-01-419-9504
NSN 6150-01-447-0077
NSN 5835-01-064-2165
NSN 7035-01-254-3606
NSN 5905-00-323-0332
NSN 2925-00-211-4761