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 , TAA (ADJSHELF)

Solid rack shelf. While the shelf itself is of fixed length, the mounting brackets can be adjusted to proper depth. Which was pretty easy to do. 2 screws for each bracket (total 8 screws). Installing it in my rack was simple; probably took me an hour altogether. Though as you can see from my pics, I have full access from all sides. Might be more difficult to do in more enclosed racks.As you can see in the pics, I placed my tower server and other peripherals on the shelf. It's not flimsy, so I had no concerns if the shelf could support the weight or not.

Writing this review after purchasing six of these over the years. I have a full size server rack that houses my home network and home theater gear. This is a very strong shelf. It's unlikely you'll ever put 175 pounds of stuff on this shelf unless you're using it for a non-standard purpose, such as storing bags of cement or bricks.I have two, 4U servers that are home-built, meaning they didn't come with rack rails. Though you can get generic rack rails, they never work correctly and are more trouble than they are worth. Those go on these shelves.I have a a Denon HT receiver/amp that weighs about 30 pounds. A regular, 2U rackmount shelf just bends and isn't safe. So that goes on one of these shelves too.There is a trick to installing these shelves in a rack and it helps big time if your rack has open sides like mine does. Only attach the front mounting ears to the shelf. You will need about 4U worth of space to slide the shelf into the rack with the front ears attached b/c the screws that hold the ears to the shelf stick out and won't clear the rack rails. You'll have to angle the shelf diagonally a little bit to slide it in. Loosely secure the front brackets to the rack rails. Loosely install the rear brackets on the shelf, leaving them loose enough to slide back and forth. Tighten the rear mounting ears to the rack rails. Tighten the rear brackets to the shelf. Now, tighten the front brackets. I recommend using a socket and socket wrench on the nut, while you hold the screw in place with a Philips screwdriver to tighten the brackets to the shelf. The brackets are what hold the shelf up. Tighten the snot out of the brackets and you'll never have a problem.The mounting ears are exactly 1U in height, meaning if you intend on mounting something directly underneath the shelf, you have to ensure the brackets don't sag downwards into the 1U space directly underneath it b/c it will interfere with whatever you're trying to slide into that space.Other than those quirks, these things are built like a tank. I've had 100 pound UPS's and servers that weighed almost that much on these shelves and they don't bend, break, creak or do anything but sit there and take it.Pre-pandemic these shelves were about 25% cheaper than they are now. But, everything has gone up in price. Welcome to the new reality, I guess. Highly recommend this rackmount shelf!

The product description doesn't make it clear that this shelf is designed for 4-post racks only. You have to download the PDF manual from StarTech's website to confirm this. I ordered this shelf anyway for a 2-post rack, figuring I could modify it easily for a 2-poster.I own a number of other StarTech products (rack hardware, server enclosures, etc.), and I've been very impressed with StarTech's quality. I was equally impressed with the quality of this shelf. It's well-designed, well-built, and very strong. The shelf surface is welded to a "frame" that can hold significant weight.And as I estimated, the shelf was very easy to modify for my 2-post rack. I only had to drill three holes per side -- six total -- to mount the four included rack "ears" to the shelf frame using the included nuts/bolts. (I used existing "slots" for the fourth hole for each side.) It took me a total of 30 minutes to measure, drill, and clean up.Note that the shelf also comes with eight 10-32 rack screws for mounting into a rack. 10-32 threading is the most common for audio/video racks, but 12-24 is the standard for IT and telecom racks. Therefore, I had to supply my own 12-24 rack screws -- not a big deal since most purchasers of this shelf will already have their own rack screws to match their racks.

There is nothing special about this rack shelf. It's simple enough to put together, it holds a decent amount of weight and works correctly. My only word of warning is to make sure the ends line up with your rack depth before purchase and during installation. Installation is easier with 2 people than 1. This is the only downside and why I gave it 4 instead of 5 stars.This shelf is currently being used to hold a 4U whitebox and it hasn't had a single issue since installation and I don't expect any issues to arise. There is no warping or bending so far. I will check again after a year but I doubt it will be an issue.If you need just a shelf in your rack, this item should server you just fine.

I have some heavy Cisco Firepower devices and this was a perfect solution. No more tilting. Super Strong. Great Quality !!!

This is an excellent shelf. As others advised, the adjustable part is a bit misleading. The shelf is fixed at 27-1/2" deep with a standard 19" rack width and 1U height It is adjustable in that the mounting brackets can be slide up and down the sides so that it fits multiple rack depths. The caveat is having some part of the shelf protrude if your rack is less than 27-1/2" deep. If this will work for your requirements, then this is a good shelf. It is well ventilated, designed and made from heavy duty metal. It will support the weight it is advertised to support - 175 lb..

Used for mounting a keyboard, mouse and monitor on a 2 Post rack and it's working great! I am sure this shelf could support much heavier items!

Overall the shelves are very nice and feel very sturdy. They were a bit snug trying to get them installed in my server rack at first. Once they were properly installed, they feel very secure and support my server equipment nicely. Overall a good purchase and would recommend if you're looking for adjustable shelves.