A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-00-342-5126
NSN 5910-01-571-8500
NSN 6610-01-237-5815
NSN 5998-01-242-6782
NSN 5895-00-596-8678
NSN 5910-01-149-6950
NSN 5915-00-422-0538
NSN 6105-01-254-9781
NSN 5945-00-038-7776
NSN 7035-01-388-6943
NSN 5920-01-629-1168
NSN 6620-01-431-9176