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

Input:
Question: What size screw do you need for the glide stop plastic piece? My packet didn't come with screws for this.
Document: The arm glides in/out on a greased track with four plastic (Delrin?) bearing points. After a long time of resting my wrists (get the optional palm rest), the tray sticks in position, but a little force frees it to glide in/out again.The one disadvantage over those cheap keyboard trays is the size of the support arm. It sticks down 6.3 inches even when set for minimim profile (tray neither raised nor lowered). I've learned not to bang my knees on this "immovable object."
First of all, it's a high quality piece. It's easy to install and comes with everything you need. You do need to be careful though as the spring is quite strong and you can pinch something if you're not careful when installing it. It does everything you expect it to and raises high above the desk just as promised. My beef with it is the arm does not slide freely on the rails and the pivot is very tight and not smooth. This may be good for some people that want it to stay put once they have it set somewhere, but I'm comparing it to the ones we have at work which are very smooth and easy to position.
It doesn't push back when I'm typing. It pulls out and up easily and the mouse tray is adjustable for right/left and for size.Great purchase.
I ended up returning this product (which the company seems to be doing without a problem) due to it's overall size and weight. It is very bulky and not really what I was hoping for.
This is a strong keyboard tray and really heavy and stable. The directions consisted of two different sheets of directions (not so good) and I also had leftover screws that didn't fit anything. A good deal except for the directions.
I did notice that you could easily make your own keyboard tray and it will bolt on to the arm with the mouse tray if the size of the keyboard tray is insufficient. Overall, great product and the price is excellent compared to arms that aren't as nice or sturdy.
Like many, I rarely make time to leave a product review. This deserves it.Instead of spending $900-$1500 for a sit/stand desk I wanted to build my own. I was only short the monitor arms and a keyboard stand that would have enough of a positive rise to accomodate someone that was 6'0 or greater. This was perfect. At 6'0 and full vertical extension my elbows are almost a perfect 90 degrees standing straight up.The mouse pad has a gentle enough texture for a smooth glide but enough grip so you don't throw it off when adjusting the stand.
This is a great keyboard arm. I've been using it for a little over a month with no problems. It is very sturdy and easy to use. The arm stays solid when resting your hands on it to type -- I don't find any drop or jiggle. I have found that, when tilting the tray back to lower it, the mouse can slide off, but that's not really a big deal if you're careful. The keyboard tray itself is a plastic composite, but does not feel or look cheap. The mouse tray is solid and coated.
Use the holes in the flat plate as your template to mark and drill, then put in your screws, slide the arm back on, and attach the tray. The most difficult part will be making sure the width of the tray (approximately 21 inches w/o the mouse pad extended) fits the width of your pencil drawer or keyboard tray on your desk. Yes, even a woman can assemble this!
To anyone that is interested in getting a sit/stand articulating keyboard arm, this is a REALLY NICE product. I've purchased millions of dollars of systems furniture and with it... a few thousand keyboard arms, of varying manufactures. This one is of steel construction (track, arm, and tray structure)the actual tray is plastic but well built and the High Density Plastic slide mouse (left and right) is of great quality. The articulating arm has a vertical articulation of 12" with a tilt/lift function.
Answer: no