Boasting Mercurys patented Flo-Torq II system, the Propeller Hub Kit allows you to install a Mercury propeller on virtually any motor. It resists slippage but flexes during engine shifting, and it cushions the drivetrain in the event of an impact. Includes forward-thrust washer, drive sleeve, drive-sleeve adapter, locking tab washer and propeller nut. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Hub Kits.