A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-00-279-2887
NSN 5996-00-137-2684
NSN 5998-01-608-4771
NSN 6150-01-213-9353
NSN 5965-01-322-8136
NSN 5910-01-021-9172
NSN 6240-01-425-1659
NSN 5935-01-661-3047
NSN 2925-00-063-5898
NSN 5996-00-265-7067
NSN 5999-01-161-2721
NSN 6105-01-181-4503