A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-00-080-6967
NSN 6105-00-456-1433
NSN 6145-01-522-2892
NSN 6650-00-126-8990
NSN 5905-00-277-7439
NSN 5965-01-101-9094
NSN 4140-01-378-2651
NSN 5998-00-248-4964
NSN 5965-00-615-0758
NSN 5905-01-438-0525
NSN 5999-01-349-8682
NSN 5960-01-449-1310