Forget what you think you know about four-blade props. The aluminum Mercury SpitFire 8M8026640 was engineered to excel. It provides the handling you’d expect from a four-blade, with speeds that rival a three-blade. Mercury SpitFire 4-Blade Aluminum Propeller, 10.1” Diameter x 15” Pitch, Right Hand Rotation For use on Mercury and Mariner 25-30hp FourStroke BigFoot/Command Thrust, 30hp TwoStroke and FourStroke (2005 and newer), and 40hp outboards Aggressive blade geometry enhances handling and top speed, while contributing to 16-25% faster acceleration than a comparable three-blade prop Patented Mercalloy aluminum alloy is engineered specifically for crafting props that are strong, yet ductile enough to handle minor impacts The included Flo-Torq Reflex Hub Kit 835257K12 helps protect the engine drivetrain from most minor damage-causing impacts See your engine owner's manual for the thrust washers and prop nut part numbers to best fit your engine or drive with this propeller Mercury parts and accessories are backed by decades of experience in engineering, testing and manufacturing to provide the best fit, function and performance Forget what you think you know about four-blade props. The aluminum Mercury SpitFire 8M8026640 was engineered to excel. It provides the handling you’d expect from a four-blade, with speeds that rival a three-blade.