A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-216-0802
NSN 5985-01-240-1228
NSN 5990-00-024-9985
NSN 6685-01-413-2363
NSN 5855-00-079-2370
NSN 5855-00-944-0949
NSN 6220-01-136-2765
NSN 5985-00-339-2318
NSN 5925-01-124-2441
NSN 5855-01-400-1590
NSN 4140-01-310-5045
NSN 6645-01-096-4270