2 installation methods, 1) 3M Tape Double-Sided Self Adhesive, no need to drill, 2) Screw In our installation methods make sure that our Door Stoppers can be used on any surface of the wall, guarding your tile, glass, cement, wood, fiberglass, any smooth or rough surface from doorknob,furniture or cabinet impacts. Note: 3M double-sided adhesive tape should be left standing for 24 hours before use for better effect. Installment both reliable, Tape ,we choose 3M, Strong adhesive Screw, compare to others, we add a screw, triangle supporting is more stable, both of the installing mothods have a long service life, its hanging weight can be up to 10 lbs, never fall off, protect your wall for ever. you can install it on the wall, to keep the door open, or install it on the door, then do not need to damage the wall. Set of 2 included in your package, Multi colors can be chose, 3 Inches in height, Constructed of Stainless Steel, will not rust, and ensuring durability and dependability. Very well made, solid feeling and good looking, perfect to be used in home. Update Details-Kids Safe, our Bumper rubber tips are hard to be removed, we secure the tips with the screws, reduce the risk of the tips becoming a choking hazard. Rubber tip protects your door, offers a significant cushioning effect between door handle or knob and wall, also causes less noise, really necessary in any high traffic area like in school or office. Widely Applicable: Our door stops can be installed in bedroom, bathroom, living room, bussiness office, school, suitable for all of the surface of your wall, even glass. please enjoy this totally RISK FREE purchase.