1.NOTE: This magnetic door stops is NOT SUITABLE FOR INSTALLATION ON CARPET, working well for the door to the floor CLEARENCE between 6mm to15mm, NOT recommend for heavy duty door. Please CHECK THE DISTANCE BETWEEN THE DOOR AND THE FLOOR before purchasing 2.Magnetic door stopper easy to install - Simply install by use double-sided tape mount to the door, NO DRILL REQUIRED; There are also mounting screws included in the package for those consumers who prefer drilling installation 3.HIGH QUALITY-The Heavy Duty Door Stopper is Constructed of High Quality SUS 304 Stainless Steel, Solid, Sturdy and Rust-Proof 4.STRONG MAGNETIC DOOR HOLDER-- The Magnet is Strong Enough to Hold and Catch the Door 5.The metal "finger" in the floor plate is not just a decorative cover that provides access to the mounting screws; the fact that it's hinged is an integral part of how it latches the door open. The magnet that mounts to the door is actually at a slight angle. As the magnet moves over the floor plate, the hinged finger jumps up and the magnet grabs it firmly. The slight angle increases the amount of force needed to slide the magnet off the finger.