Great Planes 5mm Aluminum Propeller Drive FEATURES: Aluminum prop drive Metal hardware One year quality guarantee Fits a 5mm prop shaft INCLUDES: One Replacement Prop Drive One 3.5 x 5mm Set Screw One -28 Propeller Nut (wrench size for nut is 11mm) REQUIRES: Does not include the drive washer GPMG0856 Assembly onto a GD-600 gearbox