A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-00-728-9621
NSN 6620-01-290-8209
NSN 7035-01-398-9581
NSN 6130-00-707-5931
NSN 6105-00-156-6292
NSN 6130-01-156-6771
NSN 6220-01-599-9731
NSN 5855-01-045-9728
NSN 5998-01-647-4888
NSN 5855-01-513-1859
NSN 5895-01-450-7344
NSN 5965-00-396-3411