Features: The hidden motor shaft design is adopted to protect the motor shaft more effectively. The new propeller seat has more stable performance and more convenient disassembly. The iron core has lower load temperature and the efficiency is improved. High performance motor has small size and lightweight, yet is powerful and has long service life. With the bullet plugs pre-installed, this brushless motor comes with the necessary mounting hardware, very easy to install. The motor is designed for running clockwise and counterclockwise. To change the turning direction, just exchange the red and yellow connection wire. Metal cross base for fixing motor, with 11mm center bore, and measured size in 40*40mm. Perfect for RC plane, model airplane, mini helicopter, 3D printed car, etc.