I changed a flat tire as I have done several times but ran into a nut that would not loosen. That's when I found out about "Jumper". Most of the work involved in changing a tire is loosening the wheel nuts. Now I don't have to strain my hand with a short wrench on a compression nut. I also bought a Titan Tools 21092 19mm 1/2" socket with a deep non-scratch nut so I don't have to deform the head every time I have to use a lot of force. If you are unsure of the head size you require simply go to the Autozone website, enter your car and then search for "nut".
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