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-123 Applications: Mercury/Mariner/Mercruiser: 1-1/4" prop shaft, 19 tooth spline Great for replacement or spare prop Propeller housing sold separately | Rubex RBX-123 Propeller Interchangeable Hub Kit For Mercury/Mariner