The Croydex Shower Riser Rail Slider is an adjustable accessory designed to fit riser rails with a diameter of 18-25mm. Made from durable plastic, it is easy to install. This genuine Croydex product is covered by a manufacturer's guarantee. Croydex, established in 1919, has a long history of supplying household items and has grown into a recognised brand of bathroom accessories and fittings, operating successfully in the UK and internationally.