A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-00-931-5568
NSN 7035-00-155-9513
NSN 5990-01-132-3059
NSN 2925-01-197-7864
NSN 6320-01-246-4390
NSN 6110-00-913-2574
NSN 5960-01-328-8248
NSN 6320-01-089-9086
NSN 5998-01-534-2256
NSN 5945-00-892-1116
NSN 6650-00-052-3202
NSN 5965-00-812-9158