First, I am very happy with the delivery, as happened two days earlier.
Secondly, I take off a star because the screwdriver is twisted happened, which is not terrible because the packaging had nothing, so I was sent the screwdriver so ...
Finally, for very tight screws, as for me, it is difficult to use without "slipping" of the hands, so take care not to damage the screw or screws.
Edit: The seller sent me a second screwdriver in shortly, I am delighted. I r'ajoute a star!