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: Volvo SX Sterndrives1994 and Newer 19 tooth spline with 4-3/4 Gearcase, OMC/Cobra Sterndrives Cobra SX1994 and Newer 19 tooth spline with 4-3/4 Gearcase.