A Metal Safety Hammer Required - This sturdy all-metal rescue hammer will get you out of danger in less than a second, even under water or in a fire. We see too many tragedies in the news. So for you and your beloved family, have a safety hammer for every car, just in case. We hope you never use it in your life. Big Power Safety Hammer The hard and sharp high-hardness tungsten steel hammer head can immediately break the car window, and the hidden sharp knife can quickly cut off the seat belt. Brise Belt Cutter Glass breaker belt cutters are built into the lower end of each hammer handle. It's integrated in such a way that you won't accidentally cut yourself while still being easy to use in an emergency. The sharp stainless steel seat belt cutter makes cutting seat belts easy. Car safety hammer principle The rescue hammer is conical. When hitting the glass with a hammer, the window is strongly impacted at this stage. External force causes slight cracking. A little crack means that the internal stress distribution of the entire glass is destroyed. This time, it is enough to use lightly. A few more hits with the hammer can remove the glass shards. Tap around the glass with a sharp point, the middle part of the tempered glass is firm, and the edges and corners are weak. A good way to do this is to hit the edges and corners of the glass with a hammer, especially in the middle of the top edge of the glass. Once the glass breaks, you can hit it a few more times.