A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-879-0810
NSN 5930-01-334-2896
NSN 6650-01-633-9147
NSN 6610-00-070-4535
NSN 6220-00-980-0052
NSN 5835-01-216-5639
NSN 6105-01-123-8887
NSN 5920-01-365-5878
NSN 5920-01-516-0467
NSN 6220-01-597-2599
NSN 5950-01-524-8682
NSN 5910-00-779-6417