A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-00-072-9966
NSN 6610-01-644-9990
NSN 6110-01-436-4275
NSN 2925-01-043-9786
NSN 5895-00-568-8304
NSN 2925-01-629-9416
NSN 5960-01-151-4518
NSN 6130-00-558-0453
NSN 5920-01-517-1158
NSN 6110-01-626-8228
NSN 6610-01-303-9516
NSN 6685-01-510-3339