I was most concerned about the weight my hands can hold because I plan to use it to assemble 3D printed parts. I haven't measured how much weight the arms hold, but they are very stiff and seem to be holding quite a bit. However, since they are rigid, it's a bit difficult to align them in the exact position you want. The fact that the lever is very long also means that the whole thing can become unbalanced. The base is heavy duty aluminum and there is a hole in the bottom so it can be mounted to something heavier. when it becomes a problem. Another thing I really like is the included flashlight, which can be used individually and is USB rechargeable.