I bought this after seeing a terrible accident on the Autobahn. The car rolled over and the doors were locked so I couldn't open them. I had nothing to smash windows with to try and get people out. Luckily, a passing motorist had a crowbar. So I'm glad I made the purchase! I saw the car collide with a truck and then overturn. To test it I used this tool to break the window. On site, a paramedic actually smashed the rear window and severed the driver's seat belt. Everyone should have it!