The ACME 431 is a CNC-machined 3-blade Nibral propeller designed for versatile ski and wake boat use. With a 13.00″ diameter and 13.00″ pitch, it delivers responsive acceleration and consistent top-end control. Diameter: 13.00″ Pitch: 13.00″ Cup: .080″ Hub Length: 02.750″ Bore: 1.00″ Blades: 3 Rotation: Left