The additional lock itself is fine and certainly served its purpose. ... As long as you get it because mounted! Unfortunately, this is not the case with me, my door leaf is too thick. The additional lock are a spacer block (15 mm) - with three and more shims (0.5, 1.0 and 1.5 mm), which are unfortunately not painted silver - which is also white. These spacers bridge the gap between the lock on the door and the latch on the door frame. So far so good. Unfortunately, it works but only up to a door leaf thickness up to 18 mm! My door leaf has a thickness of 26 mm and since the system fails. There are probably additional spacers, which can be bought separately. However, these costs usury moderate (three stampings in the cent range) 3.80 EUR per set (I had 3 sets required), are hard to get and see - because unpainted - also not nice. Ok, maybe you can thus also "make friends" but unfortunately the assembly works then still not because the screws are too short! These are already spacious enough and engage with less than two threads in the lower spacer block a. The whole thing would be so much too unstable for additional security and was being torn in a relatively light pressure from the outside of the bracket. This whole "tinkering" was me then finally too much, the achievable additional security to questionable and so I am now looking for another solution. Hence three stars for a per se very good additional lock and two star deduction for limited applications.