A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-489-6139
NSN 6105-01-446-1914
NSN 6610-00-511-3328
NSN 5915-01-651-4471
NSN 5975-00-647-4968
NSN 5910-00-650-4949
NSN 6320-01-165-8932
NSN 5935-01-245-6623
NSN 6620-00-420-1061
NSN 6130-00-881-2272
NSN 6110-01-627-7453
NSN 5915-01-152-2684