This is a flimsy light product, physically it is so light it is not fit to break the toughened window glass of any car. Tried breaking a coconut with it but failed miserably. The length of the hammer is also very short so laws of physics are against it. As far as the seat belt cutter is concerned this is no way better. Highly overrated product without understanding the functionality. To sum up it is a cute ornamental toy which is of little use.