MasterGuard Hub Kit: 22 Features The MasterGuard® Hub Kit utilizes a specially designed keyway system and a hi-tech polymer designed to absorb shift shock and harmful vibrations. The small diameter design allows for more exhaust flow and higher horsepower. This hub adapts to the OEM thrust washer and prop nut. Installation is quick and easy Engine Applications and Propeller Options: EVINRUDE® / JOHNSON®: 2 stroke: 20hp, 25hp (84 & newer), 25hp commercial (93 & newer), 30hp (84 & newer), 35hp (76 & newer) Rascal® Aluminum Propellers Mfg# R1-1011 R1-1013 (Included Accessories and Parts) Hub Assembly Installation instructions Warranty: Lifetime