I have bought for my bicycle as an apparatus. And when I was actually present during a car accident as a first responder, I after several attempts was able to make them explode and then cut a belt a side window. This part is a little small in the hand, and it requires multiple attempts until one comes to success. But who even try a car window to get broken, who knows how resistant those discs.
In the car, I have a bigger tool for this, but also that this dwarf might be helpful has been proven to me ....
