2 in 1 Seat Belt Cutter and Emergency Window Breaker Hammer: One end is a seat belt cutter for cutting the seat belt, and the other end is the window breaker tool with two metal tips. hardened and sharp carbon steel. Belt-breaker: A window-breaker belt-cutter is integrated 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 Principle: The 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 hitting the hammer a few more times. Hit around the glass with a sharp tip: The middle part of the tempered glass is firm, and the edges and corners are weak. A good way is to hit the edges and corners of the glass with a hammer, especially the middle of the top edge of the glass. After the glass cracks, you can hit a few more times. 2PCS Belt Cutter Window Breaker: Note: Mounting screws are not included. You will receive the safety hammers in a set of 2, so you can be sure that in the event of an accident, the passenger always has an emergency hammer at hand Mounting bracket included. Easy to keep in glove box, door pocket or armrest box etc.