StarTech.com 1U Adjustable Vented Server Rack Mount Shelf - 175lbs - 19.5 to 38in Adjustable Mounting Depth Universal Tray for 19" AV/ Network Equipment Rack - 27.5in Deep (ADJSHELF), Black

It's a rack shelf. Rack equipment has the 'rack tax'. What you want is something strong, and this shelf really holds up. I have two of them and the extenders are really nice, I have a StarTech 25u rack and this fits perfectly. It's holding my 4u Unraid server and it's doing a fine job. Ive no worries about this buckling, or coming loose. It's a bit fiddly mounting it as 1 person but its a heavy shelf and its going to take 3-4 hands to get it fitted properly (or just brute perseverance!)All in all it's exactly what it says on the tin, you get what you pay for, and this is a quality shelf.

The shelf is great, well made and very sturdy.I just wish it was slightly cheaper as I am going to need another 1 or 2 of them I think when I finally manage to get the 25U rack from StarTech to replace my cheap and nasty 19U Ebay rack.

Good heavy duty shelf, but don’t follow the instructions…The shelf comes in 5 pieces, the main shelf, and 4 rails which allow the shelf to be adjusted to fit different depth racks. If you follow the instructions and install the 4 rails onto the shelf, then the shelf will not fit into a 19” rack because the screws stick out….You have to half assemble it, then put it in the rack, then install the other rails. Probably the worst designed piece of rack hardware I’ve ever had to install…..