Selling this lightly used Solas Rubex 203B propeller hub that I used for testing Mercury props on my Yamaha 4 stroke 175. This one has the bronze hub to prevent corrosion with saltwater use but can also be used in freshwater. This hub greatly reduces the clunk you get when going into gear and the rattle at low RPM. The thrust washer is for use on a Yamaha. If you want to use this on a Mercury it might work but will make your prop sit out 2-3mm further.