A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-00-977-3930
NSN 5999-01-287-9215
NSN 5975-00-810-1190
NSN 4140-01-569-3120
NSN 5996-01-650-3525
NSN 6135-01-281-4758
NSN 5996-01-538-4658
NSN 7035-00-126-1899
NSN 6110-00-175-3661
NSN 4140-00-547-8918
NSN 6105-01-561-8677
NSN 6150-00-314-5242