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These are good for mounting a heavy UPS to a rack - I'm using it with an APC Smart UPS.
The rails includes metric M5 + flat head bolts to mount. You must use the included flat head bolts or else equipment will not be able to slide flush against the rails. Also I wish they included both metric and imperial unit bolts ... so now my rack has a mix of both.
Build and quality of the rails is basic, they should not cost more than $10, but hey it's for a rack so it always costs more.
Overall, it does the job, I just wish they were much cheaper.
I have bought multiple pairs of these kits to mount various Norco and Supermicro servers in my rack. The are very solid and evenly distribute the weight between the 4 post rack I have. I will definitely buy more in the future for mounting additional servers and UPSes.
Good universal rails for the price. I've rack mounted 2U and 4U servers on these rails and everything feels solid. They're my go-to rails when I need an inexpensive option. Prime delivery makes it an even better deal.
Do what they need to do. cons: They are a little thick, so some of the servers I put on there had slightly thicker handles and they didn't fit so I had to take the handles off of the server so it could fit on the rack.