Review on ➡️ Aluminum Extrusion Corner Bracket - Industrial Hardware (20x20x17mm) by Zach Flores

My main complaint is that they are small, MUCH smaller than the frame they call 20mm but are actually 16mm. Then there's the issue of leading small bumps on the underside that should allow for straight alignment/connection. They are so small that they can be rotated about 30 degrees on the frame. I ended up designing and printing the corner brackets with my 3D printer, which worked 100x better. When I found this out my return had expired so I'm not sure what I'm going to do with it. I may be able to list them on Facebook Marketplace.