click on image for larger view
This arbor is used when you need to adapt a female arbor from 1/2” to a 1/2” shaft. An example would be a sanding drum with a female connection that you would like to power by a 1/2” drill or drill press.
The large end is 1/2” diameter to fit into the drum. The opposite end is 1/2” diameter.
Not as shown. Actual product does not step down in diameter.