The ACME 847 is a CNC-machined 4-blade Nibral propeller designed for ski and wakeboard boats. Featuring a large 13.50? diameter and 17.50? pitch, it delivers powerful all-around performance, efficient power transfer, and smooth wake-ideal for both recreational and high-load watersports use. Diameter13.50″Pitch17.50″Cup.105″Hub Length03.125″BoreSplineBlades4RotationLeft