A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-636-4713
NSN 6145-01-398-0607
NSN 5915-01-393-8841
NSN 5920-01-202-7166
NSN 5990-01-221-0609
NSN 5945-01-658-1551
NSN 5920-01-203-3915
NSN 5930-01-063-1446
NSN 6130-01-129-7070
NSN 6145-01-634-0388
NSN 6220-01-216-0678
NSN 6610-01-288-2339