A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-610-4410
NSN 5960-01-409-1917
NSN 6130-01-566-4687
NSN 6620-01-468-6017
NSN 5965-00-193-2406
NSN 6610-01-618-7038
NSN 5965-01-475-7540
NSN
NSN 5998-00-030-7104
NSN 6610-00-144-7036
NSN 5920-00-644-3285
NSN 5950-01-412-0262