Tire Chain Locking Lever

The operation can't be easier anymore.

The mechanism inside the device tensions the chain through sprockets in the process of driving. 

Driving the car at a low speed, any slack in the chain will be gradually strained and then the chain will be in a perfect position. 

That is to say, the drivers need not to make any further adjustments in their journey but to let the automatic device fit the chain by its own. 

Meanwhile, simplicity emerges thoroughly in the installation procedure. All you need is to press a button.