They are perfectly square, very strong and durable. Used 1/4" x 2 1/2" screws (max size, 5/16 won't fit) to wall mount, put 15" side on 2 studs 24" apart, I was afraid my desktop would sag , but this thing it's so durable I think I could stand on it with 260 pounds. I am very impressed and satisfied. Tjese suspenders have exceeded my expectations. My desk is 6.5 feet by 24 inches deep, which is more than enough.
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