Mercury Aluminum Bravo Two 17.75x 21P Propeller 48-18616A40The Mercury Black Diamond Bravo Two Aluminum Propellers are manufactured specifically for Bravo Two sterndrives. These propellers are made with Mercury's unique patented Mercalloy aluminum. This unique material allows Mercury props to have thinner blades that create less drag, resulting in optimal performance and durability.Recommended Boat Types: Commercial workboat, cruiser, houseboat, runabout - cuddyFeatures: Easy to maintain and repair; Good overall performance and value; Big blades hold steady through turns and provide more thrust; Equipped with rubber hub 43636T; Matte black; 3 Blade Die-Cast Aluminum; Specifications: Diameter: 17.75; Pitch: 21; Rotation: Standard (Right Hand); Number of Blades: 3; Material: Mercalloy Aluminum; Genuine OEM Mercury-Mercruiser part.