The ACME 422 is a CNC-machined 4-blade Nibral propeller built for wake and ski boats. With a 12.50″ diameter and 15.50″ pitch, it delivers strong acceleration, efficient power transfer, and smooth handling. Diameter: 12.50″ Pitch: 15.50″ Cup: .105″ Hub Length: 02.750″ Bore: 1.00″ Blades: 4 Rotation: Right