Just tear off the protective film of adhesive and then stick it to a clean surface(making sure adhesives are consistent in height and press firmly to squeeze the air out), and then attach the Adhesive Shower Shelves, waiting for 24 hrs put your Shower racks for inside shower on the shelve.No tools or drilling is required,no damage to the walls. It's very easy to stick to a non-textured smooth surface on tile, glass, metal, plastic, or smooth solid wood wall.Shower caddy sets can be widely suitable for different rooms in homes, apartments, dormitories, and rvs, such as kitchens, bathrooms, restrooms, tool rooms, and more.