In the description on Amazon unfortunately is not that the hook primarily for wood, glass (who has a glass ceiling ???) etc is intended. When I held the product in their hands, I read: For cleaning also be used, but then only max. 150g holding force. Well, nevertheless tried, but now I have an unsightly spot in the ceiling, the hook is in fact came down along with plaster. I think that it is unsuitable for normal ceilings, since the holding force is independent of the Power Strip, but the plaster here. Bin of the product not convinced.
