Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Can I use these in reverse as undermount shelf slides for a flat shelf for a lightweight record playing turntable?
Document: A smooth operating mechanism. Simple to use. I replaced the hardware that was on my IKEA IVAR keyboard shelf. The keyboard shelf is obsolete, but this is simple enough that you can take a regular shelf and pine panel and make one.
That's enough for a keyboard, but you can't fit your hands in there. If you like to sit close to the desk with you're hands partially under the desk, this probably isn't the best tray for you.Quality is pretty good overall. The rails are very solid and won't warp. My only complaint about quality is that the ball bearings were too tight against the rail. I had to use a pliers to losen the metal bracket holding them in so the tray slides smoother.
My husband made his own keyboard shelf using these slides. They are sturdy and work well. this is his third set, and now he is working on using them for a study table with the slides as a way to decrease the amount of space needed. the insturctions are easy to read and attaching them takes just minutes.
Works better than original slide. However my keyboard tray is 19&#34; deep and this only slides out 9 1/2 inches and is only 2&#34; down from desk. Miss being able to use the extra space
Using these sliders with a re-inforced Rubbermaid 48" shelf, as a keyboard drawer. These sliders allow the setup to work perfectly. The sliders do allow adjustable height, so a variety of keyboard, mouse, and game pad heights can be accounted and adjusted for.What else to say? They work as described perfectly.
Good working slides. Only complaint is that part of the slide hangs below the mounting bracket so it is visible and possible to hit your knee on it.
very strong. Way more than i needed but also just right. fixed my problem with trying to use the old broken one.
These rails glide okay, as long as you line them up perfectly. I was a little off on my first install and they aren't very forgiving. They don't glide freely, meaning you can't just bump the tray when you're done with the keyboard and expect it to slide all the way home.
This is very good well build product. I am giving 4 star as the screw that came with stripped out easily and I used my owned. You will need your own tray, but overall very good. A bit hard to install, but with right tool, you should be able to install within 30 minutes or so.
We used this hardware to make a keyboard slider for our desktop pc, which has a nook in the living room media center. Just a note, you have to pull the slider on each rail to get it moving before you install. Out of the box, our sliders were quite tight and immovable, we thought maybe we didn't get all the parts. A call to the manufacturer solved the matter over the phone.
Answer: yes