A determined thief can use a hack saw to cut through the steering wheel and slide off the locking club. I have a locking club I use on occasion. But yeah, it's usually enough to deter most thieves. It's always a good idea to keep any valuable items (GPS, tools, etc) out of plain view. I use to keep my tool box in the bed of my Ram. Now I have it on the floor in the back. My cheap code reader and multi-meter are well hidden.