Mercury - Bravo Three Diesel Stainless Steel Propeller - 4-Blade Forward - 3-Blade Rear - 260 - 370 HP - 15 Dia. - 21 Pitch - 48-8M0074866. Designed for use on heavier boats featuring high horsepower diesel engines. A large diameter four-blade front propeller coupled with a smaller diameter, three-blade rear propeller provides unmatched acceleration, tracking, and handling with diesel applications. Extra cup built into the trailing edges of both front and rear props captures the torque generated by today's turbocharged diesel engines. Best performing propeller for modern diesel engines matched to Bravo III drives.. Key Features:. Left-hand, 4-blade forward and right-hand, 3-blade rear propellers. Enhanced blade cup for improved planing performance and fuel economy. Recommended for 260 - 370 HP diesel engines.. Fit for use on standard Bravo Three, Bravo Three X, and Bravo Three XR drives.. Bravo Three Diesel Propellers feature a durable matte finish. Moving from the standard Bravo Three