Cabin Crew Emergency Hammer | Supercheap Auto- window breaking hammer ,Being able to quickly and easily remove your seatbelt or break through a window in an emergency can be the difference between life and tragedy. The Cabin Crew Emergency Hammer features a tungsten point head, ideal for breaking through safety glass, commonly found in vehicles.Best Car Window Breakers 2021: For Emergencies28/3/2021· Tucked away on the top of the hammer head is a spring-loaded window breaker. To use it, you push the head of the hammer against a side window in your car, which primes the spring and sends a spike of metal through the glass, breaking it. But it also has a hardened steel glass-breaking hammer. This is great for two reasons.