2 Pack Emergency Car Window Breaker and Seatbelt Cutter - Black & Red Safety Hammer Tool for Vehicle Escape - 2-in-1 Glass Breaker & Seat Belt Cutter for Cars, Trucks, SUVs - Perfect for Emergency Situations, Roadside Safety Kits, and First Responders

When I tested the first Car Window Breaker, the glass target completely shattered and glass pieces went all over the table. I suspect an actual car window safety glass would have just cracked a lot, but that’s fine. With one or two more shots with the breaker at other corners, the glass would be so fractured that it could be pushed out, or if you were already under water, the water presssure alone would push the side window in. I tried to get my wife to test it, but she didn’t want to try because of all the glass that flew around during the first test. We now have one it each car.