A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-372-4780
NSN 5996-01-400-1640
NSN 6145-01-317-2226
NSN 6320-01-455-2808
NSN 6320-01-558-8844
NSN 6685-01-532-8662
NSN 5915-01-070-8470
NSN 6320-01-454-1965
NSN 5996-00-504-9032
NSN 5925-01-542-9068
NSN 5855-00-179-8588
NSN 5998-01-355-0765