The ADI PRO Magnetic Door Holder comes with a 1” bar which, combined with the separately sold 3” and 7” extension bars, caters to a wide variety of door designs and wall distances. The extension bars can be easily affixed to the armature of the magnetic holder to increase the size of the armature, thereby bridging the gap between the armature plate and the door holder. This makes it possible to create a secure and effective magnetic alignment regardless of the distance between the armature plate and the door holder.