Magnets situated on the rear side of a holder are protected by a plastics foil so they cannot scratch a metal surface. Fasten cup or bottle holder anywhere onto a metal surface, e.g. on a fridge, shelf wall, doorframe or assembling box.

Except beverages, various objects may be situated in the holder, e. g. stand with writing utensils, documents, newspapers, books, working aids, etc.  

Observe water intake rules even in most demanding conditions.