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 bronze 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: Mercury/Mariner/Mercruiser 40-60 HP Bigfoot, 40-140 HP (except 135 HP) V4 Gearcase (1978 and Newer) 15 tooth spline with 4-1/4" Gearcase, 90HP and 115HP (Command Thrust) (2014 and Newer), 135 HP (1987 and Newer), 150-300 HP (1978 and Newer) 15 tooth spline with 4-3/4" Gearcase, Mercruiser Alpha One and Bravo One (less than 400HP) 15 tooth spline, Yamaha 80-140 HP (1977-83) 15 tooth spline with 4-1/4" Gearcase, 150-175 HP (1978-83) 15 tooth spline with 4-3/4" gearcase, Honda BF 75-90 (1995-98) 15 tooth spline with 4-1/4" Gearcase, Force 75-150 HP (Thru Hub Exhaust) (1995-99), 85-150 HP (Dual Exhaust) (1988-94) 15 Tooth Spline with 4-3/4" Gearcase.