ERY79S Easy to use this product with one touches folding system and sole driving with high speed. Small steering with this steering knob lips， drive more safely. Mount on car steering wheel and it gives you the ability to turn the steering wheel faster since the ball spins. Great adjustable car accessory designed for you to help better control of your steering wheel with one hand in driving. You can control your car to turn the corner more quickly or you can have a more comfortable driving position with it. Suitable for all steering wheels cars， trucks and boats. Easy to install to your steering wheel.