Wide Application: The shower head holder fits 18-19mm outer diameter round shower rail. You can adjust the size of the shower support bracket to attach it to the rail flexibly by the rotary switch in the end position. Note: Do not overtighten the rotary switch or tighten it with a wrench. Easy Installation: No tools are needed, no need to disassemble the shower slide bar, just loosen the switch on the end of the shower support bracket, then it can be installed on the shower slide bar. 360 degree rotation: The shower head holders can be rotated 360 degrees freely. To make it easier to adjust the spray angle, you can tighten or loosen the bracket screw depending on the weight of your shower. Note: Do not overtighten the bracket screw. Protective and non-slip design: Built-in silicone pad, to hold the shower holder in place and protect the shower slide from daily scratches. Durable Construction: The shower head holder is made of engineering grade ABS material. Coated in an industry leading chrome finish, designed to resist daily scratches and corrosion.