There are 2 good reasons to use these: to prevent the ring binder mechanism sliding on the glass and to prevent scratches on the glass board if the ring binder is pulled diagonally

But you must be aware that they can be very difficult to handle if you use more than 1 magnet on the glass board: 2 magnets colliding with each other will shatter

From the Swiss brand Trendform

if used outdoors for longer periods of time

pallet overview for the warehouse or outdoor information in the goods reception

Dørstopper sæt gummimagnet + metalplade (large) tier4 There are 2 good reasonsLarge door stopper set for the heavy front door Do you have a heavy front door or patio door? Then this door stopper set with a rubber magnet and metal plate is just the thing for you. You really only need a few screws and voila the door can be kept open without any problems. This door holder set gives you both a beautiful and durable solution. You choose whether it is the metal plate or the magnet that should be on the door. You get in the package 1