No holes needed on walls and doors---3M double-sided tape, no need to drill or install with screws (screws are included in the package). It is recommended to install the magnetic door stop with screws, which is more stable and durable to use or use a hair dryer to heat the back of the tape for strong stickiness. Adjustable magnetic door stop---The adjustable height is 0-16mm. The gap between the door and the floor should be 5-30mm. ⚠Not recommended for heavy doors. Please carefully measure the door gap before installation, and then use a hexagonal wrench to adjust the door stop magnetically to the correct height. Compact size and hidden hole design---The magnetic door stop adopts an ultra-thin door base (thickness about 4mm) with hidden screw holes, which will not affect daily mopping and cleaning. The invisible magnetic door stop is suitable for families with elderly people, protecting the elderly and sons and daughters from tripping. Strong magnetism for doors---The door stop floor installation has strong magnetic force, which can firmly grasp and block the door, avoid the door from slamming and reduce noise. The door stop can be installed on many surfaces: wood metal glass drywall cement, etc. Very suitable for residential or light commercial use. Stainless Steel Door Stop --- The magnetic door stop is made of 304 stainless steel, which is rust-proof and corrosion-resistant, with high hardness, collision-resistant, durable, suitable for indoor and outdoor use. With elegant black paint finish, the magnetic door stop adhesive is suitable for a variety of decorative styles.