I give it three stars because I have a Smart Fortwo 2004 and the arm does not reach the windshield of my car and just stands on the dashboard, so I feel that it is not long enough to prevent the steering wheel from moving (i.e. it has enough room for movement). Definitely, you should put the screw that cuts off the head, otherwise someone can simply unscrew the arm and turn the steering wheel, but this may limit you from reusing it on another car. It is quite heavy because it is made of iron, so it becomes a bit tiring for everyday use... Essentially, it protects more from someone stealing your driver's airbag and making it look like you have taken precautions for anti-theft (because it is visible due to its color and size) rather than actually locking the steering wheel and effectively preventing theft. Also, it is of Chinese manufacture with an Italian lock and not entirely made in Italy. If it did the same things and cost half the price, it would be very fair, but overall I would not buy it again.