Buy this if you want to protect sockets. By that, I mean to protect them forever, because the puller you must use to remove them is made from relatively cheap plastic, so it will break off eventually (more sooner than later). However, if it is not for child protection but dust protection, then you can put them loosely in the electric socket and they will nicely cover it. The size is okay. It can be a bit tight with some stronger clamps in the sockets, but not to the point where they get stuck forever unless you drill them out.
works in for electricity in Israel