I bought it for extending the charging cable of the electric car. It is a thing for fixing walls, so if you think carefully about usage, it is very convenient.
The things were firm. Installation was easy.
When connecting the VVF cable, you need to cut off the side of the square type outlet, but if you cut it like bending it with pliers or the like, cracks will occur in a range more than planned. It is best to process so that only the width of the VVF cable can be easily cut off more certainly. The same is true when connecting grounding wires. This time I cut it out with money saw.