First of all, I rate here both the extension and the safety gate. Our child is very active and concerned also like to boxes, stools or other items to make up for his lack of size. He also comes into effect at all perhaps even let mom and dad so lying on the work surface in the kitchen. This can be a knife sometimes even. Therefore, we decided for a safety gate. It was paid to cover the 86 cm old building door. That was not a problem even with appropriate extension (7cm). The manual is clear and you need certainly no study to fix the grid. To adjust and to protect the door frame adhesive mounts are fixed to the door frame. In our case, this will be in contact for lack of space only 2/3, but this is still the shaking our young withstands (2 years). Will be how to remove these brackets the time show. It is mounted TOOL-FREE! The door can be a little hit more than 90 degrees, and the locking mechanism is smooth but complicated enough that a toddler this not aufbekommt. The door locked while not only the top but also at the skirting board. Warning! Feet lift, because the door was like in the pictures to see a metal skirting the need to be overcome. That certainly takes only a few days until you get used to it and even when young, the concept was understood after the fifth fall. Conclusion: I would buy this grille again and the extensions are useful in any case. The price is for the secure feeling that one has as a parent more than adequate.