Glass breaker

Glass breakers can also be distinguished into categories based on size, and whether they are intended to remain stationary in the vehicle or everyday carry by a person.

Its primary use is for breaking through vehicle windows and vertical glazing, which are often tempered, in the event of a crash which prevents exit through the doors.

They are commonly found on public transport, in particular trains and buses and buildings worldwide (except North America including Canada and the United States).

to provide a means of escape should the doors/windows become unusable, such as in a collision, if the vehicle falls into water and is sinking[6] or there is a fire within a building.

To break the glass, the metal tip is held up against the window and a pin is pulled back and released to activate a spring, either automatically or manually.

Spring-loaded glass breakers can be designed to be used underwater or to simply reduce the strength needed to shatter a window.

They were originally used by the notorious criminals Nisbett and Hockaday to steal from expensive vehicles until their arrest in 1941 in which the glass breaker was now being mass produced.