The Necessity of Using a Metal Safety Hammer- This sturdy all-metal rescue hammer allows you to escape danger in less than a second, even under water or fire. We have seen too many tragedies in the s. So for you and your beloved family members, please prepare a safety hammer for each car just in case. And we hope you never use it in your life. Great Power Safety HammerHard and sharp high hardness tungsten steel hammer tip, can immediately smash the window, with a knife cutting edge that can quickly cut the seat belt. Belt BreakerA window-breaking seat belt cutter is built into the lower end of the handle of each hammer. It is built in such a way that it is impossible for you to cut yourself accidentally, while remaining easy to use in an emergency. The razor-sharp stainless steel seat belt cutter makes it easy to cut the seat belt. Car Safety Hammer PrincipleThe rescue hammer is tapered. When the glass is hit with a hammer, so the car glass is strongly affected at this time. External force causes slight cracking. a little cracking means that the internal stress distribution of the whole glass is destroyed, this time, just use it gently. Glass shards can be removed by knocking the hammer a few more times. Hit around the glass with a sharp pointThe middle part of the tempered glass is firm, and the edges and corners are weak. A way 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 cracks, you can hit a few more times.