They look great and are secure. The thicker the metal you glue them to, the better. Fridges are actually pretty thin and slick so heavy items can cause them to slide down, while my tool cabinet is twice as thick, creating a more stable "stick" that can support more weight. They are VERY strong when used on thick materials like angle iron and the like. In fact, I dare say you might even be wasting that sturdy hook if you attach it to the fridge and hang a piece of paper on it. For such purposes, the weakest and cheapest will probably do. It will really shine in an industrial setting where the strength of the magnets can pay off. Of course, they stick a little better than weaker magnets, but the thickness of the mounting surface has a huge impact on holding power.
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