Our 7/16" x 1" outside corners are made of high strength plastic, they will withstand years of exposure without corroding or distorting. Just press them into the screen frame and they hold snug and square. These corners are designed to fit our 7/16" x 1" frame.
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These molded plastic corners worked well and are a tight, precision fit in the 7/16" x 1" roll formed aluminum frame pieces. I wasn't able to "press" the plastic corners in but they went in well with a few taps of a rubber mallet. The assembly ended up very strong.