The RBX Interchangeable Hub seats to the propeller hub cavity in order to eliminate hub chatter and vibration while preventing spinning within the propeller. It features a one-piece rubber construction with anodized aluminum splines - no plastics to deteriorate. Hubs offer 10° deflection to reduce banging when shifting gears or hitting a submerged object. All RBX hubs are reusable if the propeller is damaged. Designed for use with the following: Yamaha T50 (1996 and Newer), T60 (2003 and Newer), 60 HP (not F60) (1992-05), 70-100 HP (not F75B, F90B and F100B) (1984 and Newer); 15 tooth spline, 4-1/4" Gearcase.