Ideally your cylinder lock (common on most upvc doors) should be flush with the handle case or at the very most only protrude by 5mm (left-hand picture). If this is not the case (right-hand picture) the lock is vulnerable to snapping – this is a common technique used by burglars. An anti-snap lock fitted correctly will greatly reduce the chances of an illegal entry. For a free security survey call GRN on 07889 325487

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