A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-590-6625
NSN 5950-01-465-2249
NSN 5996-00-061-0336
NSN 6130-00-357-2995
NSN 5999-01-354-7246
NSN 6240-01-208-0401
NSN 6610-01-370-2405
NSN 4140-01-303-5103
NSN 5999-01-288-0297
NSN 5965-01-197-6924
NSN 6320-01-600-5808
NSN 5998-00-426-0676