One of the problem that could occur when you install a connected door is that  you might remotely open the door by mistake. In this case, the bolt moves inside the door lock and the door slides open and it can't be closed because the door lock is not in front of the door frame anymore. This magnets holder is designed to keep the door closed when the Okidokeys connected lock unlocks the door. For this door holder to work, you need a door frame and a door that are made of steel.