Quality socket, easily and securely fits into its box.
Attention, the insert part of the socket (the part that goes inside the box) is single, don't be fooled by the fact that it has 2 female sockets in front.

Generally, I prefer the abb brand, so having its equivalent, I will tell you about the differences. I liked that this one has a more rounded design and that it tightens much better on the wall than the abb. This one is made in Poland, while the abb is made in Germany. However, both are equally good in terms of quality. In this one, the positions on the cables are screw-in, while in the abb they are snap-in. Another positive aspect is the lower price

I highly recommend them. They are the only double socket for a single hole outlet that have suited me. All the others I have tried were clearly inferior: they had more difficult installation, worse tightening hooks (easily came off) and screws that easily wore out. With these, I don't have to worry. I had bought the same ones before, I have had them for at least 4 years and they have never given me any problems, even though I have had to put them on/take them off a few times. I have now changed all the outlets in the house and so I have double outlets everywhere (e.g. nightstands: one for the lamp, one for the phone) without dealing with extension cords and power strips, which are also less safe.

If you have switches or outlets nearby, it doesn't fit well and looks a bit ugly and bulky compared to the single one, but it is still a reliable good socket