High Security Deadbolt for Entrance doors A key is needed to Lock and Unlock from outside, no need for a key to Lock and Unlock from inside, instead is unlocked with a thumb-turn style lever from the interior 70mm length 30mm Projection off door Modern Design Comes with 2 x keys as standard DescriptionA stylish Delf Single Cylinder Deadbolt is a durable, sturdy and secure lock for your doors. Single Cylinder Deadbolts are locked and unlocked with a key from the outside but does not require a key for locking and unlocking from the inside, which instead is unlocked with a thumb-turn style lever from the interior.A deadbolt lock is distinguished by the locking bolt which extends out of the lock allowing it to go into a wall to secure the door. As this puts a single metal bolt from the door into the wall it makes forcing the door open almost impossible when a deadbolt is locked, perfect for that extra security.SpecificationMaterialStainless SteelRequired Door Thickness35mmInstallationDownload Installation Instructions here What's In The Box Delf Single Cylinder Deadbolt Stainless Steel 2 x keys