Changing Lifestyles Safe-er-Grip Portable Shower Arm, Contrasted White with gray accents The product is port shower arm mount For placement on tile, tile squares must be at least 4 inch x 4 inch in diameter Must be applied to smooth, dry, non-porous surfaces, such as, glazed ceramic tiles, plastic or glass. Item does not suction to textured or bumpy surfaces; this surface MUST be smooth and flat Product does NOT suction to drywall Do not place over grout lines as this allows air to move under the suction cup thereby releasing its hold. Always test to confirm suction is tight before each use Suction cup design allows you to place the arm at what ever height desired Can be easily moved or relocated Easy to install and remove