Home security is facing a new threat called lock snapping, a technique used by thieves to break into peoples homes within seconds . The effects can be devastating for victims. As well as losing valued possessions and the trauma of knowing someone has been sneaking around your home, its now time to fight back. Properties particularly at risk are those fitted with cylinder mechanisms, this applies to all UPVC doors and composite doors. Also most static caravan doors and some garage doors are fitted with cylinder locks.