SAVE TIME; No need to put a stopper every time in a cluttered environment SPRING-OPERATED; Spring to cushion the collision when the magnet sticks to the door DIMENSIONS; 53x32x30mm MAGNET ATTACHES; The magnet attaches to the floor and the magnetic piece attaches to the door MATERIAL; Floor Mounted Magnetic Door Metal Stopper Floor Mounted Magnetic Door Stopper in Brushed Metal Hold the door open without having to put a stopper down, which could be a hazard to stumble. line up the magnetic piece on the door and use the supplied screw to secure it in place. You can now open the door and it will stick to the magnet and stay there until you close it.