I bought these to put kayaks on a roof rack. However, using them to step on a doorknob wasn't very reliable. I was able to stand in the door of my car and get onto the roof without those door steps. I think if you had a car that was higher in the air it would work. However, for underground vehicles, I consider this a waste of time and money, and possibly even more a waste of money if it ruins your doorknob...
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