A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-163-0453
NSN 5925-01-349-7193
NSN 6145-01-331-1656
NSN 5965-00-142-9052
NSN 4140-01-392-9808
NSN 6135-01-351-1131
NSN 6240-01-140-0732
NSN 5905-01-274-3950
NSN 6145-00-994-0820
NSN 6320-00-110-8005
NSN 6240-00-813-6328
NSN 5925-00-421-6629