These clamps are not designed to jump start a car. I bought these to power my small air pump battery. The pump came with a cigarette lighter or auxiliary plug, but I don't like using it for something that uses more power than a cell phone. To me, the wires in them aren't that big for something that draws 8-10 amps. These clamps are perfect for my application. Wires are actually more than air pumps. The plastic sleeve slips off when you pull it, but a few drops of superglue on each fixed that.
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