1, High quality zinc alloy construction magnetic door stopper. Finished in brushed stainless steel, resistant to corrosion and rust. 2, Strong magnet on the door stopper holds the door open. Disengaged by gently pulling the door away from the door stopper and avoid the door being suddenly closed. 3, Base size is 5MM, quite thin and prevent kicking and tripping. 4, Self-adhesive: 3M adhesive provides extra strength and longevity, just peel and stick. No drilling required. You can also install it with screws. 5, Easy to install: Come with 3M self-adhesive and screws. Please note that the installation distance of the magnet piece from the ground should be 5-12mm, otherwise it cannot be adsorbed. Product Description Strong Magnetic Metal Door Stopper Heavy Duty Door Stopper with 3M Floor Mounted Conceal Self Adhesive Screws Strong Magnetic Door Stopper A strong magnet on the door stopper door lock keeps the door open. Disengaged by gently pulling the door away from the door stopper and avoid the door closing suddenly. Thick and Safe The height of the base is about 5mm , thin enough to prevent kicking and tripping. The door gap distance cannot exceed 12MM Please note that the installation distance of the magnetic part to the ground should be 5-12mm, otherwise it cannot be adsorbed. No drilling required. You can also install it with screws Easy to install: Comes with 3M sticker and screws. You can choose drilling or non-drilling installations.