Premium materials: tungsten steel. Modern industrial teeth and rescue tools. We dare not rush and easily break 10mm tempered glass. Recommended for homeowners but we hope you don't use it ever. Quick to use: When you break a window you have to be brave to save yourself. This safety hammer has a sharp tungsten steel hammer tip that breaks the window easily. Concealed steel knife: The safety belt is cut quickly by built-in safety pliers which are very sharp. In the event of an accident the seat belt can be cut quickly to escape. TPE Soft Rubber Holder: non-slip no falling good hand feeling surface with anti-slip line.It is stable does not peel off at a critical moment and bold blows are safer. Tip: Automotive glass is a kind of high-strength tempered glass with strong impact resistance. The middle part of the glass is stronger while the corners are more fragile. You must hit the corners of the glass with a safety hammer.