These are M6 x 16mm bolts and cage nuts. They're easy to assemble unless you have a cat that shouldn't be in the server room playing with the screw pack. Yes, they work as intended. Be honest, what kind of review can you write for this product? The tightened bolts were securely fastened to the captive nuts. However, before using it, I had to insert cage nuts as shown in the picture.
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