Y-T001A Car Bus Safety Hammer Sound and Light Alarm Emergency Escape Tool

Mainly the use of life-saving hammer conical tip, due to the tip of the contact area is very small, so when the hammer smashes the glass, the contact point of the glass pressure is quite large (which is a little similar to the principle of the nail), and so that the car glass in the point by a large external force and produce a slight crack. For tempered glass, a little bit of cracking means that the whole piece of glass internal stress distribution has been damaged, thus producing countless cobweb-like cracks in an instant, at this time as long as the hammer gently smashed a few more times to remove the glass fragments.