1.It has spikes,which c an stop the vehicles by breaking into the tire when the vehicles are driven awat by force.

2.With the soft rubber cover on the handle.It can make comfortable for users to hold it,and avoid the hurt of the users'hands.

3.It has the function of moveable of cover nut,which can fits all the tires with the diameter below 80cm.

4.It adopts the rocking handle to operate the two works,making it more convenience.

5.With the rubber around the cover nut,it can effectively prevent the scratch of the cover nut itself and the wheel .