A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-288-8752
NSN 5999-01-220-1767
NSN 5998-01-618-8224
NSN 5960-01-235-2586
NSN 5960-00-161-9345
NSN 5998-01-461-9935
NSN 5920-00-276-8657
NSN 5930-01-644-9012
NSN 5905-01-133-1049
NSN 6150-00-516-4223
NSN 6110-01-489-5482
NSN 6685-01-461-8873