A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-158-6878
NSN 4140-00-707-5963
NSN 5835-01-457-7951
NSN 5915-01-063-7134
NSN 5920-00-180-4278
NSN 6240-01-442-7746
NSN 5835-01-052-8464
NSN 6320-01-571-8974
NSN 5910-01-441-2301
NSN 6110-00-202-1021
NSN 6130-00-221-9609
NSN 5910-00-062-2315