Moisture-resistant material: The shower door rollers are made of stainless steel, PA plastic, and POM wear-resistant wheels, which are strong and durable, have stable quality, and have a long service life. Shower door roller size: The shower door roller has a diameter of 23 mm, which is suitable for glass doors with a thickness of about 4 to 6 mm and is compatible with glass installation holes of 11 mm diameter. 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 just 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 better open and close the door. Suitable for shower