The Double Locking Nightlatch is designed to replace most existing front door locks|The main lock bolt is ‘automatically’ deadlocked when the door is closed, preventing the main bolt being retracted by a credit card|The inside handle can be deadlocked by an anti-clockwise turn of the key from the inside so securing the lock against forced entry|The bolt can be held in the withdrawn position (only) with the use of the snib feature|This product is ideal for solid panelled doors|An ergonomic internal locking handle which offers added security against forced entry|Interior & Exterior|Material: Zinc Alloy|Fixings included|10 year guarantee and warranty