A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-075-7732
NSN 5935-00-467-2847
NSN 5945-01-536-6115
NSN 5998-00-249-2872
NSN 5996-00-987-9080
NSN 4140-00-881-9912
NSN 6130-01-179-5968
NSN 6145-01-064-1665
NSN 5975-01-207-9532
NSN 6620-00-701-3575
NSN 5930-01-575-2241
NSN 5985-00-146-2450