The ACME 3865 is a CNC-machined 4-blade Nibral propeller optimized for large ski and wakeboard boats. With a 16.00″ diameter and 18.25″ pitch, it offers strong mid-range pull and efficient top-end cruise. Diameter: 16.00″ Pitch: 18.25″ Cup: .105″ Hub Length: 02.750″ Bore: 1.125″ Blades: 4 Rotation: Left