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Choosing the Right Security Lock For Your Van The right security lock can deter thieves and help protect your cargo. Certain locks are designed to be used for DIY installation, while others require help from a professional to ensure they are fitted correctly and provide maximum security. Slam locks are perfect for couriers who make deliveries with multiple drops as they lock automatically when you push the door shut. Deadlocks work in tandem with the lock that you have purchased from the manufacturer and provide a further layer of security. Deadlock