A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-449-2233
NSN 6135-01-333-6737
NSN 6145-00-067-7436
NSN 5835-01-208-8800
NSN 5925-00-683-7877
NSN 6650-01-545-2834
NSN 5915-01-651-0144
NSN 5985-01-358-3524
NSN 4140-00-012-3506
NSN 6320-01-021-6633
NSN 6320-01-397-9995
NSN 5895-00-101-7782