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: Evinrude/Johnson/BRP 40 and 50 HP (4-Stroke) (1999-05); 13 tooth spline 3-1/4" Gearcase, Suzuki DT 35C (1987-89), DT 40 (1983-98), DF 40 and DF 50 (4-Stroke) (1999-10), DF 40A and DF 50A (4-Stroke) (2011 and Newer), DT 50 and 50M (1983-84), DT 55 (1985-97), DT 60 (1983-84), DF 60A (4-Stroke) (2010 and Newer), DT 65 (1985-97); 13 tooth spline, 3-1/4" Gearcase.