Turning Point - Express OS Mach3 Stainless Steel Propeller - Right Hand - 3-Blade - 15.6" x 11 Pitch - 31511110. Express Mach3 OS Stainless Steel 3 Blade Props for 150-300+hp Engines with 4.75" Gearcases.. Big Blades for Big Horsepower.. Improvements to the cup, leading, and trailing edges and the aggressive progressive rake and blade geometry that are turning point hallmarks.. Excellent hole shot.. Impressive bow lift.. Class leading cornering.. Perfectly matched to large horsepower bay boats,