The aluminum rail included in this kit is surprisingly strong! Aluminum isn't just an AC duct, it's thick and reinforced. This supports both the tool box and the truck rail so the rail does not bend. My tool box used smaller screws so I had to drill enough through the tool box to use the heavy duty screw. I'm not concerned about bending the truck rail or the plastic rail cover. This allows the hook to be absolutely securely attached to the rail. My tool box is aluminum so I'm going to use a large steel washer to keep the tool box from bending. I would also use this for a steel truck and tool box it's so well done.
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