It has a really strong magnet as described. I like it. However, here in Pennsylvania I still wouldn't put it on the underside of a car where winter snow or slush can easily strip it off. It works well on the top frame or sheet metal surface. It's big enough for a large Ford chip key. I wrapped the key in plastic wrap to protect the key from corrosion which has been a problem with other key holders I've used. (not this brand) Better safe than sorry. I am changing my rating. I kept my key safe until I needed to use it. The key holder detached from the surface but the magnets stayed. Miracles in one fell swoop.
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