I stuck the adhesive hooks on the roughcast and hung a picture with 3.8kg on it. The picture is still where it should be. I have ordered more adhesive hooks. They are great! The adjustable ones are perfect.

No, there is no such thing: https://www.tesa.com/de-ch/suche?q=klebehaken&searchPath=keyword Here are all products that carry 5 or more kg at Galaxus: https://www.galaxus.ch/de/s4/producttype/klebehaken-klebenagel-3492?filter=n_6380%3D5000_9%7C5400_9%7C6000_9%7C7200_9%7C8000_9%7C10000_9%7C12000_9

They have held up for me so far. I have a picture weighing approx. 1 kg on it. Unfortunately, they could not be removed from the plastered walls without damage.

I am not exactly sure, but I think this could also work. If you want to be sure, ask the manufacturer directly, they will know for sure. Homepage https://www.tesa.com/de-ch/buero-und-zuhause/kontakt I hope I could help you a little.

If you have followed the instructions correctly, it works very well - just pull the tabs down and it is cleanly gone! :D