No Hole on Your Wall & Door --- 3M double-sided adhesive tape without drilling or mount with screws (screws have been included in the package). RECOMMEND to mount magnetic door stopper with screws, more stable and durable in use / Or using hair drier to heat the back of adhesive tape for strong viscosity. Adjustable Magnetic Door Stops --- Adjustable height is 0-16mm. Gap between door and floor should be at 5-30mm. NOT RECOMMENED TO HEAVY DOORS. PLEASE measure door gap carefully before installation then use hex wrench to adjust door stopper magnetic to correct height. Compact Size & Concealed Holes Design --- Magnetic door stops features in extra-thin door base(thickness about 4mm) with hidden screw holes, dont affect daily mopping and cleaning. Invisible magnetic door catch fits for family with /the old, protect the aged and toddler from tripping. Strong Magnetism To Cath Door --- Door stop floor mount has strong magnetic force, which can catch and stop doors firmly, avoid door slamming and reduce noise. Door stopper can be installed on many surface: wood/metal/glass/drywall/cement ect. Ideal for residential or light-commercial use. Door Stopper Stainless Steel --- Magnetic door catch is made of 304 Stainless Steel, rustproof and anti corrosion, strong hardness and collision resistance, durable in use for indoors and outdoors. Elegant black paint finished, magnetic door stoppers adhesive fit many decorating styles.