I think that there is no feature in this respect. It is an ordinary desk turner. It is a product to assemble by yourself. When removing the part at the time of assembly, the metal piece at the time of the screw hole remained inside the frame part. I tried to remove it myself, but since it seemed to be daunting, I decided to remove it and assembled as it was. Although it is worrisome when it shakes, it sounds like a piece of metal and piece of metal, but if it assembles it will not be shaken, so it will no longer sound. It is small because it has 2 steps, but I think that the storage property is good.