HARD MATERIAL: Featuring a solid tungsten steel head and a gun-type spring, the Safehammer Glass Breaker delivers instant impact force to break windows efficiently. Its working principle ensures a swift window break in just 0.1 seconds, with an impact force of 8kg.QUICK ESCAPE: Save precious seconds during emergencies by carrying the Hammerdex Glass Breaker in your car. This essential tool allows for quick escape in the event of an accident, potentially saving lives.SAFE & EASY TO USE: The Hammerdex Glass Breaker is designed to break tempered glass windows, allowing for a safe and quick exit from the vehicle. Simply align the U-shaped mouth of the cutter with the seat belt, push it forward quickly, and escape easily without hurting your hands.NOTE: It's important to note that the Hammerdex Glass Breaker is intended for breaking tempered glass side windows only. Laminated glass such as front and rear windshields cannot be broken with this tool.DURABLE & RELIABLE: The Breeker Glass Breaker is a durable and reliable tool designed to assist you in emergency situations. With its sturdy construction, it provides peace of mind knowing you can quickly exit your vehicle when needed.