A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-307-6009
NSN 6145-00-793-7816
NSN 5920-01-443-0523
NSN 6110-01-204-9226
NSN 6135-01-062-9356
NSN 5950-01-129-1374
NSN 5930-01-629-6545
NSN 5835-01-190-5192
NSN 6110-01-176-8802
NSN 5945-01-197-7966
NSN 6320-01-450-7083
NSN 6610-01-519-3080