A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-00-456-1736
NSN 5895-01-539-2942
NSN 6110-00-369-8499
NSN 5935-01-263-0868
NSN 5998-00-262-4107
NSN 6320-01-578-6006
NSN 6150-01-438-4392
NSN 5920-00-683-7883
NSN 5990-00-554-0366
NSN 5855-00-896-4047
NSN 6620-01-206-4896
NSN 4140-01-012-6377