A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-239-2102
NSN 6105-00-508-1239
NSN 6685-01-174-9574
NSN 5990-01-433-7886
NSN 5999-01-508-0218
NSN 6320-01-141-3791
NSN 6150-01-205-0566
NSN 6105-00-139-7851
NSN 6220-01-607-0748
NSN 6610-00-633-4338
NSN 5920-01-175-2808
NSN 5998-01-304-7678