Good but not s' not suitable for all earthing

I am not arrived to return the plug of my microwave oven "Proline" (and that's a shame because my purchase was for his decision).
So I tested it on other made similar land.
---> They return there.

I'm not an electrician, but I find that the male rod to the diameter of the center is rather thin (and this is what must interfere with the taking of my oven and prevent insertion.
So it is a criterion to be taken into account.