The safety gate we einbeaut as stair gates, after our Berner Puppy moved. It is quickly unpacked and also grown rapidly. No drilling or long marking. But we had to take the 14 cm extension to because the grid is designed for very narrow doors or staircases. But even that's not a problem. The locking mechanism is easy to operate and the grid overall very stable. It served its purpose 100%. Can recommend without hesitation.