Billet Aluminum Conversion Bushing Bushing has 3/4" ID with 3/16 keyway Purpose of bushing is to convert your 1 1/4" Hub to a 3/4" hub. The picture shows the bushing you will receive on the left, the picture on the right show how the bushing is inserted into a 1 1/4" hub. Will fit any 1 1/4" hub Hub is 1" Long