A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-133-4047
NSN 5985-00-808-5814
NSN 4140-00-136-9214
NSN 6610-01-235-5566
NSN 6110-00-789-3730
NSN 6650-00-254-8966
NSN 6240-00-717-0844
NSN 5999-01-589-2099
NSN 7035-00-238-3662
NSN 5910-00-538-4659
NSN 5920-01-444-1700
NSN 2925-01-457-5649