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You will find the data sheet for MagHook 40 here

Colour: Red/white

4-ring - Ring binder mechanisms without magnets

Made of stainless steel

Pottemagnet m. udvendigt gevind, Ø32 mm. ludo maxi but it doesn't make muchVery strong neodymium magnet with threaded stud (M6). 2 of these pot magnets with threaded stud cannot be used directly towards each other as their poles are pointing the same way. Pot magnets are made of strong neodymium magnets in a steel cap. The steel increases the magnetic strength, and the threaded stud has the same function as a bolt (or screw). You can use the magnets with a M6 nut. All pot magnets are sold individually buy the excact number