Moisture-proof material: The shower door roller is made of stainless steel, PA plastic, POM wear-resistant wheels, strong and durable, stable quality and long service life. Shower door roller Size: The shower door roller has a diameter of 23mm, which is suitable for glass doors with a thickness of about 4-6mm and is compatible with 11mm diameter glass installation holes. Silent and wear-resistant casters: The bearing is flat and smooth, and the door can be moved easily by gently pulling the door. There is no noise when moving, very quiet and will not cause noise in your life. We have included a screw and a nut. You only need to align the roller with the glass mounting hole and use a screwdriver to tighten the screws. The included nut protects the screw from moisture and reduces rust.Scope of application: Sliding door roller It is a good helper for the bathroom sliding door, helping you open and close the door better.Suitable for shower rooms, massage cabinets, bathrooms, massage bathtubs, etc.