A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-565-9420
NSN 6145-01-374-1899
NSN 5835-01-004-2563
NSN 5945-00-960-9849
NSN 5935-00-470-1836
NSN 5915-01-045-1677
NSN 6220-00-659-9455
NSN 6645-00-137-7699
NSN 5975-01-385-2241
NSN 6130-00-205-1714
NSN 5935-00-942-1559
NSN 6645-00-097-1748