A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-056-7815
NSN 6240-00-299-9819
NSN 5985-01-528-0795
NSN 5996-01-489-5494
NSN 5930-00-842-9997
NSN 6685-00-883-1036
NSN 5999-01-371-5616
NSN 5930-00-229-6630
NSN 5945-01-478-5866
NSN 5998-00-254-0485
NSN 5935-01-207-2688
NSN 4140-01-658-6428