1. when stop the vehicle, pull the handbrake and take out the product which aligned the U - shaped opening position to the tire
2. lock: lock handle to pull outside, adjust the size of the tire and then stuck in the tire, rotate the key clockwisely, turn it until to the end.
3. Unlock: take out the key, insert the key hole, turn 90 degree anti-clockwise, pull the lock handle out, then you can take it out.
4. Remove the lock from the tire, turn the key clockwise by 90 degree, then pull out the key