A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-515-1911
NSN 6105-01-086-2688
NSN 6130-01-572-6460
NSN 5985-01-408-2895
NSN 5950-00-221-5235
NSN 6105-00-782-0721
NSN 5945-01-612-4255
NSN 5930-00-345-6879
NSN 6240-00-951-6643
NSN 5895-00-351-2986
NSN 5950-01-546-3864
NSN 5915-00-763-1197