THESE MAGNETS ARE NOT FOR 50lbs of force. While it can take some bumps while the car is moving, if the car even slows down and the box gets stuck on something under the car, it won't take much effort to remove the box. Withstanding 50 pounds of force means it takes over 50 pounds of personal force to remove the box. This does NOT apply to these magnets! Very easy to remove from metal!
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