This sliding bracket is designed for use on a rectangular shower rail kit. Suitable for standard shower heads, shower clamps for shower heads with standard connector. Fully adjustable: just press the button to adjust the height of the supports on the rail and release to fix it. Easy to install, simple to use. To fit 18mm width, 30mm length rail. Dimensions: 30*18mm To fit 18mm width, 30mm length. Contents: 1 shower head holder. Note: The measurements are taken by hand , the sizes indicated may vary by 1 to 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.Specifications: To fit 18mm width, 30mm length. Contents: 1 shower head holder. Product color: silver Note: Due to hand measurement, sizes shown may vary by 1-3mm. 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.