A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-634-0668
NSN 6145-01-120-7647
NSN 6105-00-422-4098
NSN 5996-01-343-5529
NSN 5910-01-060-2661
NSN 5975-00-202-5013
NSN 5975-01-003-2198
NSN 5998-01-055-2206
NSN 6130-00-188-3709
NSN 5950-01-469-5974
NSN 5835-00-543-1325
NSN 4140-00-542-4611