The ACME 3097 is a CNC machined 4 blade Nibral propeller engineered for wake and ski boats requiring high thrust. With a 16.50″ diameter and 13.75″ average pitch, it offers strong hole shot and clean wakes. Diameter: 16.50″ Pitch: 13.75″ (AVG) Cup: .150″ Hub Length: 03.125″ Bore: Splined Blades: 4 Rotation: Left