Boat Plastic Propeller. 40mm: propeller is 40mm(3 blades), it is suitable for boat length about 80CM - 120CM; mounting hole position is 25mm or 29mm, like 775/3650/3660/3674/4074 motor. 15mm: propeller is 15mm(2 blades), it is suitable for boat length about 30CM - 60CM; mounting hole position 16.5mm, like 380/390/2040/2430/2440/2450 motor.
