Mercury - Quicksilver 835257K1 Flo-Torq II Propeller Hub Kit Mercury 40-300HP Outboards & MerCruiser Sterndrives (Under 400HP) 835257K1. Overview. Get smooth performance and peace of mind with the Quicksilver 835257K1 Flo-Torq II Propeller Hub Kit. Designed for Mercury 40-60HP Command Thrust and BigFoot outboards, Mercury and Mariner 70-300HP outboards, Force 90-120HP outboards, and MerCruiser Alpha One and Bravo One sterndrives under 400HP, this kit adds a layer of protection between your prop