A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-00-014-5008
NSN 6320-00-593-0379
NSN 5920-00-959-5664
NSN 5960-00-490-0138
NSN 5960-01-323-6432
NSN 6130-01-123-9041
NSN 6110-00-078-8565
NSN 5960-01-648-1872
NSN 5935-01-457-0485
NSN 6320-01-150-5378
NSN 5965-00-320-7821
NSN 5915-01-043-3875