High-Quality Material: The shower roller is made of high-quality iron and nylon material, which can be used for a long time in a humid environment, is not easy to corrode, has strong support, and has a long service life. Durable Base: Nylon roller, flat and smooth, the door can be easily moved by gently pulling the door. There is almost no sound when it moves, very quiet and won't make any noise in your life. Roller Size: A total of 8 rollers are included in the package. Its diameter is 25 mm, suitable for glass doors with a thickness of about 4-6 mm and compatible with glass mounting holes with a diameter of 12-14 mm. Easy to Use: This shower door roller replacement is very easy to install. We include screws and nuts. All you need to do is align the rollers with the glass mounting holes and use a screwdriver to tighten the screws. Functional and Practical: This bathroom sliding door wheel is a good helper for the bathroom sliding door, helping you to open and close the door better. Can be applied to massage cabins, bathrooms, etc.