A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-450-3952
NSN 6685-01-650-6873
NSN 5965-00-871-2678
NSN 5920-01-274-3965
NSN 5935-01-543-0140
NSN 6135-00-209-6918
NSN 5935-00-701-9197
NSN 6650-01-024-9554
NSN 4140-01-571-7913
NSN 6110-00-167-7522
NSN 5996-00-199-0073
NSN 5965-00-520-2686