A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-361-1285
NSN 5895-00-708-2116
NSN 6220-01-096-9082
NSN 5910-01-151-9781
NSN 5920-01-650-6510
NSN 5835-01-252-5879
NSN 5855-01-400-1590
NSN 5996-01-348-1285
NSN 5985-00-932-2702
NSN 4140-00-806-8768
NSN 6150-00-911-7131
NSN 5835-01-473-1620