This sliding bracket is designed to be used on a rectangular shower bar. Suitable for standard shower heads, shower clamps for shower heads with standard connector. Fully adjustable: simply press the button to adjust the height of the brackets on the rail and release to secure it in place. Easy to install, operator simplicity. To fit 18mm width, 30mm length. < p>Dimensions: 11.8 x 4 x 2.3 cm. Please measure the diameter of the rail before purchase. And if you have any problems, do not hesitate to contact us. Features: Dimensions: 30 x 10 .2 x 2.3 cm. To fit 18 mm width, 30 mm length. Contents: 1 shower head holder. Note: Since measurements are taken by hand, the sizes indicated may vary by 1-3 mm. Please only order if you accept this margin of error. The color of the actual item may vary from the color of the photos, depending on the display settings and brightness of your computer. Thank you for your understanding.