1964-72 Hurst Gear Shift Knob. Fine thread (3/8x24)with black letters. For 4 speed transmissions, 1 7/8" round, includes lock nut. This listing is for ONE Whiteshift ball with black letters. the ball is exact reproduction of the original. fine thread 3/8 x24 thread. this fits all factory shift handles and all hurst shift handles. and most other aftermarket shift handles.