A clamp design where the clamp is made to be hung in place first, and then secured into place, making it much easier to hang units with this style clamp by yourself. Also, due to the curve in the top of the clamp, the whole load can be supported without the clamp fastened. This is of course very unsafe to do in most applications, but can be very useful. Also, this style clamp can be tightened all the way and removed with no tools. It is important to note that most designs of this clamp are very difficult to tighten unless the clamp is taking weight.