Chrome 3-Tier Metal Wire Shelving Unit (36 in. W x 37 in. H x 14 in. D)

If you are buying the 3 tier rack the wheels that home depot sells will not fit. The threaded studs are too big for the 3 tier shelf

Yes, the vertical lengths come in two sections and they are exactly 1/2 the total height. This means they are about 36 inches tall.

It can be as much or as little as you want it to be. The kit comes with 5 shelves and we spaced ours at around 13-14" between each shelf which gave us room for the tools that we wanted to store with it. You can control the shelf spacing in 1" increments along the entire length of the support poles, so if you want a shelf that is 3" apart, you can do that.

Yes.

Yes, they sell them in the store for 20 bucks.

Yes.

You can adjust the height of the shelves on the bars to make one or two of the shelves smaller or larger as needed, but once you put them on, it would be really hard to go back to change them.

There were no wheels in my box. You could probably add wheels. I would look to see if it is possible, but my shelves are fully loaded now.

Yes. The black clips are movable on the poles to whatever height you want each shelve to be.

You would need to use a rubber mallet to force the corners of the shelf up and then move the plastic clips either up or down the bar to where you want the shelf to be and then push (or use the rubber mallet) on the shelf to force them back onto the plastic clips. Depending on where you are moving the shelf, you may have to start from the top and begin removing the shelves one at a time to adjust the shelf to where you want. Moving the shelves are doable, but not easy.