I used these heavy duty arms to make the Gentleman's Bars for physical therapy. They are extremely strong with 2 1/2" lag bolts in the lugs. I attached the longer edge to the wall so I needed 3 screws per wall. 3 holes were difficult to get to with the tie rods but with the drill extension I did did it.All in all a very solid product and everything you need for a bookshelf!
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