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-114 Applications: Force: 40/50 HP 1995-98, 70 HP 1991-95, 75 HP 1996-98, 13 tooth splineMercury/Mariner/Mercruiser: 30 HP 1994 & Newer; 35 HP 1984-89; Model 402~500 1974-84; Model 650 1972-76; Model 700 1977-84; 40/50 HP (2&4-Stroke, Not Bigfoot) 1977 & Newer; 48 HP (Mariner) All Years; 55 HP (Mercury/Sea Pro/Marathon) 1995 & Newer;60 HP (Not Bigfoot or Sea Pro) 1978 & Newer; 60 HP (Mariner) 1976;70 HP Thru 1983; 13 Tooth spline Great for replacement or spare prop Propeller housing sold separately | Rubex RBX-114 Propeller Interchangeable Hub Kit For Force 40-75 HP