Title: Not for Concrete
Product review: These things are not at all safe. They may work out on dirt, but if you try to use them on a concrete floor, raising the front of a rear wheel drive vehicle (or the rear of a front drive), they shoot out from under the wheels and become lethal projectiles. One of them actually put a huge dent in the front of my Snap-On roll around and it would have surely shattered the ankle of anyone it had hit. I have a set of these plastic POS's and won't even give them away for fear of them injuring someone. Go for a good set of welded angle iron ramps and stay FAR, FAR away from these killers.
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