This wheel lock has two lockable panels for attaching and removing the wheel cover. Comes with a key to open the panels. When the panels are open, use a special key to attach the trunk to the wheel. A panel has drive access for opening and closing the toe of the boot. Another accesses the disc to attach the cymbal to your bike. Once both are attached to your wheel, use the key to close the panels. After using it six times, the key to the jaw adjustment panel no longer opens the panel. Luckily it broke trying to put it on my bike. Imagine what an inconvenience it would be if the trunk was on the steering wheel and I tried to remove it and the key would not open the access hatch. I would get stuck. I am contacting the manufacturer to resolve the issue.