I would rate them a 5 as they fit perfectly, are black to match my rack and have a built in washer. Unfortunately, I read an article on this topic by an IT snob who has enough experience to know what perfection is, but it's too late for me. I went through most of the two 50 packs on a 9U rack because I replaced a lot of the chrome or otherwise improper nuts that came with the installed hardware. I also recommend a nut setting tool with pliers. (Luxury cage nut insertion/extraction tool)
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