I found this item by looking for a power tap box for audio that is heavy for my own work. I took the delivered item in my hand and it was the weight I expected. The power strip that you made is also stable, and plugging and unplugging can be carried out reliably. However, the screws seemed to be frozen when the attached screws were tightened firmly and removed. I thought that it was a good idea to have kept it with a good hardness, as it would make it impossible to use it as a box rather than manufacturing it if the screw was snug.