The ACME 668 is a precision-machined 4-blade Nibral propeller built for wake and ski boats. With a 12.50? diameter and 15.50? pitch, it delivers strong acceleration, crisp handling, and smooth throttle response-perfect for performance-minded watersports enthusiasts.Part: 668Blades: 4Diameter: 12.50″Pitch: 15.50″Cup: .150″Hub Length: 2.75″Bore: 1.00″Rotation: Right-HandMaterial: NibralManufacturing: CNC MachinedMade in USA