When I read it was "available" in clamp or through-the-desk, I hoped that didn't mean I had to buy something else to mount it the way I wanted, but, no, it arrived with the clamp mount attached to the foot and with a little bag containing the plates required for converting it to "through-the-desk" mounting. Excellent, easy-to-follow instructions and it took very little time to convert it. The arm is easy to set up and offers a wide range of movements as well as the ability to tighten up parts so that they don't move when you don't want them to. I had no problem setting it up so that it swings freely to position the monitor where I want it ...view more