Wide Application:shower head holder fits round shower riser rail of 18-19MM O.D. You can adjust the size of the shower holder bracket to clamp it to the rail flexibly through the rotatable switch at the end position. Note: Do not tighten the rotatable switch too tight, and do not tighten it with a spanner. Easy Installation: No tools are needed, no need to disassemble the shower slide bar, just loosen the switch at the end of the shower holder bracket, then it can be installed on the shower slide bar. 360 Degree Rotation: The shower head holders can rotate 360 degrees freely. To make it easier to adjust the spray angle, you can tighten or loosen the bracket screw according to the weight of your shower. Note: Do not tighten the bracket screw too tight. Protective And Anti-Slipping Design: Built-in silicone pad, to keep the shower holder in place and protect the shower slider rail from daily scratches. Durable Construction: The shower head holder is made of engineering grade ABS material. Coated with industry-leading chrome finish, build to resist daily scratches and corrosions.