The RBX Interchangeable Hub features an all rubber construction for durability and includes no plastic parts that will deteriorate. The hub connects to the propeller hub cavity in order to eliminate hub chatter and vibration. One-piece design includes anodized aluminum splines. Interchangeable hub offers 10' deflection to reduce banging when shifting gears or hitting a submerged object. Unique hub design will not spin in propeller and is reusable, even if damage occurs to the prop housing. Interchanges with Mercury Flo-torque and Michigan Vortex propellers. The RBX Hub Kit does not include prop nut, tab washer, or cotter pin. Propeller Housings are sold separately. RBX-203 Applications: Mercury Marine: 225 EFI (4-stroke, manufactured by Yamaha)Yamaha: 115 HP, FS115 (4-stroke) & 130 HP, 1984 - present, 15 spline prop shaft; 150-300 HP, 1984 - present, 15 spline prop shaft; 225 EFI (4-stroke); Sterndrives, 1989 - 1993, 15 spline prop shaft Great for replacement or spare prop Propeller housing sold separately | Rubex RBX-203 Prop Interchangeable Hub Kit For Yamaha 115-250 HP