A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-600-0348
NSN 5990-01-147-5225
NSN 6150-00-932-3669
NSN 5945-00-074-1434
NSN 7035-00-782-7046
NSN 6150-00-449-7862
NSN 6130-00-100-0175
NSN 5920-01-511-8194
NSN 5835-01-098-3628
NSN 4140-00-255-7799
NSN 5999-01-245-9762
NSN 6610-00-244-2816