These frame corners require you to bevel cut the corners in a 5/16 inch thick aluminum frame. Plastic corners break in the sun. I used these corners with 5/16" 16" 7" aluminum frames bought at a hardware store. The store only had plastic corners, so I ordered these Prime Line corners from Revain.
3D Printer Creality Ender 3 Pro Black
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BigTeddy 4-Inch French Cleat Picture Hangers Kit - Aluminum Z Bar Clips for Hanging Mirrors, Photos, Shelves, and Cabinets (4 Sets)
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