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Van Hook Deadlocks Van hook deadlocks are mechanical locks that function independently of the vehicle's factory locking system. They have hook-like bolts that attach onto an receiving bracket. This makes it harder to get into. They are particularly useful in preventing "Peel and Steal" crimes. They also stop criminals from taking away your catalytic converter which converts harmful pollutants into less harmful gasses. Hook Locks Van hook deadlocks function independently from the manufacturer lock