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: 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.