This sponge holder works best on non-porous, impermeable, smooth surfaces such as metal, glass, tile, stainless steel, and acrylic. However, it is not suitable for uneven tiles, textured panels, unfinished marble, wallpaper, painted walls, etc. Please note that it should not be stuck on grout lines. If you encounter problems during the first installation, wash the suction cup, dry it with a hair dryer, and test it on a smooth glass surface. If the suction holds, it means the initial wall may not be suitable for the suction cup, so please change the installation location. It features 1-second installation and is removable. Simply select a smooth, dry surface without any grout, remove the protective cover, and push the push board hard until you hear a puff sound—installation is completed in 1 second. No screws, nails, glue, or tools are needed. The kitchen sink caddy can be repositioned multiple times and removed without leaving residues. Measuring 6.1 in. x 2.9 in. x 3.5 in. it creates sink storage in compact spaces. Made of aluminum with a rustproof coating, it not only prevents rust but also stands the test of time. With an all-around drainage design, the sponge caddy ensures maximum air ventilation and fully drains water away. It can hold sponges, scrubbers, scouring pads, drain stoppers, and more, keeping your kitchen tools dry and clean quickly.