The ACME?3905 is a CNC-machined 4-blade Nibral propeller tuned for smooth, responsive performance in wake and ski boats. With a 15.00″ diameter and 10.50″ pitch, it offers clean throttle response and crisp power. Diameter: 15.00″ Pitch: 10.50″ Cup: .105″ Hub Length: 03.125″ Bore: Splined Blades: 4 Rotation: Left