Review on Adjustable Depth 1U 19 inch Server Rack Rails by StarTech.com - Universal 4 Post Rack Mount Rails Kit for Network Equipment, Servers, and UPS - Compatible with HPE ProLiant and Dell PowerEdge (UNIRAILS1UB) by Ronnie Segobiano

I have this to support a Cisco SG350X-48P that is sagging in the rack. I have other drawers/adjustable shelves that already have rails installed so i thought it would be great. These guides were bolted together on arrival and then you have to take them apart, figure out what depth you need and then try to find the right stretch/compression distance by having to choose different bolt holes I assembled each set of rails 5 times before it worked. Sometimes the rail had enough room to slide into the slot but it would hit one of the fixed screws so I had to take out the screws and move them around. pa In order not to overlap, which would make more sense, there are segmented slots with stops that prevent more than two inches from being pulled out before having to remove and reinstall the screws in different holes. Then I realized that the rails are completely blocking the fan connectors on the side of the Cisco switch. I ended up turning one of the rails on the fan side upside down. Good thing I had free rack space at the bottom so I could do that. But any 1U device that has an outlet/inlet on the side of the case will block airflow with these rails. I don't want to risk it with a POE server or switch. Would definitely not recommend or buy again.