The ACME?3879 is a CNC-machined 3-blade Nibral propeller crafted for high-efficiency wake and ski boats. With a 13.625″ diameter and 15.50″ pitch, it combines strong acceleration with smooth ride quality. Diameter: 13.625″ Pitch: 15.50″ Cup: .150″ Hub Length: 03.125″ Bore: Splined Blades: 3 Rotation: Left