This is a MUST HAVE for anyone. Every window has a pressure point in its corner. This tool is designed to gain immediate access to an individual who needs to be extricated after a car accident, a suspect who just does not want to come out and play, and for yourslef if you are ever trapped and need a quick escape. How many times have you seen a LEO attempt entry with a nightstick? It takes forever. Just pull back on the spring-loaded center punch, set, press the edge firmly against the coner of the car window where the pressure point is, and release the spring-loaded center punch. Watch the glass fly! If you like the person on the other side of the glass..ie. injured vic, then you need to use duct tape and cross it from corner to corner and up and down so the glass when it cracks does not spray the vic. And don't foget to tell the vic to cover themselves if possible. AGAIN, I REPEAT, AS A FORMER VOLUNTEER AMBULANCE FIRST RESPONDER, THIS TOOL WAS INTRODUCED IN OUR LIGHT EXTRICATION COURSE, AND IS A MUST HAVE AS IT MAY SAVE YOUR LIFE OR THE LIFE OF A VICTIM!