Built a foldup desk top out of 3/4" plywood. Approx 5' wide and 3' deep. Two brackets hold it up. I use it as a stand-up desk for sorting papers. so I'm not putting a lot of pressure on the edge and creating a long moment-arm. But the brackets are sturdy enough to support something that big, and go up and down easily. Do be extra cautious, I put a fold-down leg near the front edge, but don't have to use it for my purposes. No trouble with installation
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