The Window Breaker is a unique tool available only on the Victorinox Rescue Tool.
It is used to shatter toughened safety glass by providing the very small and sharp point of impact that is required to break this type of glass. Once the glass has been shattered, depending on the glass type, it can be pushed out by hand, or cut through using the Rescue Tool's glass saw.
The tool occupies the spot in the Swiss Army Knife usually taken by the can-opener. It is replaceable and when it becomes blunt it can be removed from the Rescue Tool, using a pair of pliers and replaced with a separately purchasable replacement blade. This operation is explained in the Rescue Tool's user manual.
Replacement part number: A8590