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Another approach to mounting floating shelves uses dowels to secure the shelf frame to studs in the wall. The results are pretty surprising. 50 pound bags of concrete are added to the shelf to test how long it can hold up. The conclusion that is reached with all the strength tests that are done just show how surprisingly strong floating shelves can be. Depending on the purposes needed, different installation techniques can result in shelves that fill many purposes including being strong enough to hold heavier items.