A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-499-9816
NSN 5930-01-095-8913
NSN 6130-01-062-1934
NSN 6110-01-435-8831
NSN 5985-00-292-9206
NSN 5895-01-448-9587
NSN 2925-01-197-7864
NSN 5999-01-298-3507
NSN 6145-01-643-9937
NSN 5975-00-380-5753
NSN 5975-01-303-6772
NSN 5935-00-074-9495