A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-00-023-4993
NSN 6145-00-060-2493
NSN 5920-00-180-4278
NSN 5930-00-844-8470
NSN 6130-00-314-4742
NSN 6610-01-425-1523
NSN 5835-01-370-8912
NSN 4140-01-330-8141
NSN 6145-01-398-0607
NSN 5950-01-020-6008
NSN 5920-01-438-0232
NSN 5905-00-605-1523