https://www.thekeylab.co.uk/van-security/
L4V Hook Deadlocks L4V hook deadlocks are an upgrade to front and side van doors, as well tailgates and cab doors. They work independently of the locking system and are secured using a high-security keys. Designed specifically to combat attacks of 'peel and steal' this product has been tested by an independent lab increasing resistance by up to 300%. It is perfect for multi-drop couriers as well as applications where the driver may forget to lock the vehicle door. Hook Deadlock A hook deadlock is a lock that can be installed on a vehicle's door