https://articlescad.com/10-fac....ts-about-van-hookloc
L4V Hook Deadlocks L4V hook deadlocks are an upgrade to the rear and side van doors as well as tailgates and cab doors. They are not tied to the locking system of the manufacturer and secured with a high-security key. This product, created to combat 'peel-and-steal' attacks It has been tested by an independent lab and can increase resistance by up to 300 percent. It is perfect for multi-drop couriers as well as applications where the driver is unable to lock the door of their vehi