Moisture-proof material: The shower door roller is made of ABS plastic and stainless steel. Reinforced aluminum alloy connecting rod, strong support, can be used for a long time in a humid environment, no rust, corrosion resistance, strength and durability, long service life. Quiet 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. Suitable for 11mm glass mounting holes: The shower door roller is 23mm in diameter , which is suitable for glass doors with a thickness of about 4-6mm and is compatible with 11mm diameter glass installation holes. Easy to install: This shower door roller is very easy to install. 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. Good helper for bathroom door: If you have installed a glass door in your house, don't miss this sliding door. It is a good helper for bathroom sliding door, helping you open and close the door better. Suitable for shower rooms, massage cabinets, bathrooms, massage bathtubs, etc.