The brackets are heavy duty metal which is great. Unfortunately, as another reviewer wrote, the pieces don't form a 90 degree angle when snapped together as shown in the picture in the listing. I probably should have sent it back as defective but I was in a hurry and didn't want to wait for new parts. It took several hours, but with the help of a sledgehammer, I was able to bend the pieces so that they formed almost a 90 degree angle. Then I had to sand the mating surfaces a bit. Now that I changed the details they work great as you can see in my picture!
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