A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-420-6804
NSN 5998-01-409-2874
NSN 5855-01-266-1645
NSN 5960-01-480-7629
NSN 7035-01-435-4009
NSN 6110-00-781-1930
NSN 4140-01-464-9538
NSN 6685-01-341-3934
NSN 5999-01-153-2661
NSN 5960-01-098-8437
NSN 5835-01-199-5902
NSN 5930-00-347-1700