Great Planes 3.0mm to 5mm Set Screw Propeller Adapter FEATURES: Compatible with any electric flight motor having a 3mm diameter shaft Mounts onto the shaft coming out of the gearbox or motor with the inch INCLUDES: One Prop Adapter One 3.5x5mm Set Screw One 5/16 Propeller Nut REQUIRES: Installation onto the motor or gearbox shaft