See application chart for engine application information and Installation / hub kit part numbers (kits sold separately).The engineers and propeller experts at Turning Point made improvements to the cup, leading and trailing edges and the aggressive progressive rake and blade geometry that are turning point hallmarks. These modifications have produced a propeller with excellent hole shot, impressive bow lift and class leading cornering. The Express Mach3 OS is perfectly matched to large horsepower bay boats, offshore center consoles and high horsepower pontoons/tri-toons. Large diameter three blade propellers offer great mid-range fuel economy in many applications. Big Blades for Big Horsepower MaxSpeed™ Dyno balance processes with proprietary stainless steel, TP17™ Performance tuned pitch, rake angles, and exhaust vents improve all around performance Uses 500 or 700 series Installation/hub kits only (sold separately)