The Zak Tool ZT57K Key Ring Window Punch is a powerful tactical window punch to break windows in the case of an emergency. This window punch features a round knurled grip and a convenient swivel key ring clip. Zak Tool window punches are made of heat treated stainless steel and are designed to provide an indefinite period of service. Simply press and hold the pointed end against any auto safety glass. Pull back the triggering device and release. Safety glass is immediately smashed out.