Key boxes are an excellent and inexpensive way to protect emergency keys and documents from theft and wrongful use, while keeping them accessible in the event of an emergency. The STI break glass box is a helpful way to store the keys to fire alarm systems, exit doors and other keys that need to be available in the case of an emergency. Allow the keys to remain visible, while protecting them from unwanted misuse. Housing molded of super tough polycarbonate material, and offers simple glass replacement.