Buy, attach, go to a big store, pick 12" lumber, have the store cut your boards to length for your shelf. Brackets Done Anything over 36" shelf size and I would recommend 3 brackets per shelf. (If you are maintaining actual weight) Two shelf brackets on a 36" shelf holding about 100lbs was my choice for a heavy computer and large Bookshelf speakers.The included mounting hardware was mediocre at best.The included mini level is a nice touch.If I needed more of these I would buy them again.
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