THE DO-IT-YOURSELF HANDRAIL - This bathtub safety support bar attaches to any flat non-porous surface such as tile, acrylic and glass. It does not work with natural stone, porous tile, 4X4 tile or wall board. Note: If you have difficulty getting your bathtub support bar to stay in place it could mean air is seeping into the suction cups. To get a better seal, put water or petroleum jelly on the tile or the suction cups. We also recommend reattaching the handrail every two days.TOOL-FREE INSTALLATION To install shower handle simply press the suction cups against a clean, flat, wet surface and flip the locking latches to secure them in place. Dont place the suction cups over grout lines or gaps a flat, solid surface is required for proper adherence. Also, remember water or petroleum jelly can help secure a more firm seal NON-SLIP GRIP bath support handle features a non-slip grip that is ideal for seniors, elderly, handicapped, disabled, toddlers and other children. This tub support bar is great for post-surgery recovery and for preventing injury. It can even make a great foot rest for when you need to shave your legs in the shower! CONVENIENT PLACEMENT You can put this bathroom grab bar anywhere you want provided that place has a flat, non-porous surface. That means you can use this sturdy handle to balance yourself in the shower, to pull yourself up in the bathtub, to help you lower and raise yourself on the toilet and much more. Plus, you dont ever have to worry about the support bar harming the surface of your wall, this support handrail does not leave marks!