No drilling, no screws, no holes, no glue, no tools to install the shower head mount. Just choose a smooth surface, remove the protective cover, press the "PUSH" board firmly until you hear the "PUFF" sound, and the installation is completed in a second. Even kids can easily install this shower shelf. Two Gears Detachable and Adjustable - This kids shower head holder can be adjusted to different heights as they grow, and can meet the requirements of people of different heights. Reasonable design - Diameter of slot top - 2.3cm, bottom diameter - 2cm. Fits G 1/2'' universal shower connector, suitable for most household showers. This powerful shower head holder suction cup works best on smooth, non-porous, water-resistant surfaces such as glass, mirrors, polished metal, stainless steel, plastic backsplash, tile, grained granite, and more. Remember not to stick to grout lines and porous surfaces such as: wood, unfinished marble, porcelain, wallpaper, natural stone (like travertine), painted walls, etc.