The emergency hammer should be the indispensable safety tool for an auto vehicle. When in an emergency situation, It can be used easily to break up the auto safety glass; its inset blade can rapidly cut off the seatbelt binding on the driver or the passengers and makes them free from any restraint to escape. It can also be used in household, hotel, and some other places to guard against emergency. However, we sincerely hope the emergency hammer will be never used.