A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-593-7709
NSN 5835-01-028-7009
NSN 6130-01-091-4249
NSN 5835-01-519-3834
NSN 6685-00-618-2146
NSN 5998-01-170-6870
NSN 6685-01-300-7920
NSN 6220-01-045-9091
NSN 6320-00-343-1798
NSN 6610-01-397-4607
NSN 5998-01-431-9329
NSN 6105-01-047-1347