1, High Quality Zinc Alloy Metal Construction Magnetic Door Stopper. Brushed Stainless Steel Finish, heavy duty anti corrosion and rust. 2, Powerful Magnet on door stop holds door open. Disengaged by gently pulling door away from the door stop and avoid the door being suddenly closed. 3, The height of the Base is 5MM, thin enough and prevent kicking and stumbling. 4, Self Adhesive: 3M self adhesive provide extra strength and durability, just peel and stick. No Drilling required. You can also install it with screws. Product Description PHOEWON Strong Magnetic Door Stopper Metal Door Stop Heavy Duty Door Catch with 3M Self Adhesive Conceal Screws Floor Mounted Strong Magnetic Door Stopper Powerful Magnet on door stop holds door open. Disengaged by gently pulling door away from the door stop and avoid the door being suddenly closed. Thickness and Safe The height of the Base is about 5MM, thin enough and prevent kicking and stumbling. The Door Gap Distance Can't Exceed 12MM Please kindly note the Magnet Part installation distance from the ground should be 5-12mm, or it can't be adsorpted.