used them to install 2 solar panels on my cargo trailer. they work fine. Easy to raise and lower with included screws and wing nuts. The only problem I had was that when I was assembling it, I noticed that although the pieces seem to be cut the same, the two I used on the record always seemed a little wrong, even when I used the same thing hole used. can be a plate, not a metal corner. I'm not sure if the holes in the plates are turned off, they appear to be the same. works well and if you can't get them cheaper they're good.
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