A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-01-053-2969
NSN 6685-00-103-2854
NSN 5965-00-370-3855
NSN 5950-01-330-6499
NSN 6220-01-053-9377
NSN 2925-00-231-8041
NSN 5945-01-106-6981
NSN 6105-01-459-4831
NSN 5999-00-331-3411
NSN 5945-01-434-5542
NSN 6110-00-969-4030
NSN 5990-00-288-1820