A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-730-1332
NSN 6135-00-477-8847
NSN 7035-00-392-5417
NSN 5915-00-577-6179
NSN 5985-01-331-8710
NSN 6610-00-470-8209
NSN 5930-00-466-3643
NSN 5999-00-990-8837
NSN 6105-00-200-8074
NSN 6610-01-173-6323
NSN 5945-01-633-9134
NSN 6650-01-078-8179