A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-619-9860
NSN 5945-01-590-0251
NSN 5935-01-552-9695
NSN 6145-00-091-1079
NSN 5999-01-212-3094
NSN 5895-01-559-9518
NSN 6145-01-608-1169
NSN 4140-01-441-9170
NSN 5930-01-076-3980
NSN 6130-01-278-9305
NSN 6650-01-196-4667
NSN 5998-01-605-1982