Set of 8 small multi-purpose casters. Suitable for most shower enclosures, shower enclosures and steam cabins. Materials: plastic, nylon, stainless steel, POM ball screw, ABS brass axle. Wheels approximately 20mm diameter x 5mm thick. Screw Size: M4 x 12 mm. Package contents: 8 x 20mm shower door rollers. UFURMATE replacement roller can help you open the shower glass door easily. High qualityThe shower door rollers shower are made of brass and nylon pulley, which are sturdy and durable, wear-resistant, not easy to rust, and can last a long life. Nylon pulleyNylon pulley can be used smoothly, effectively reducing the noise caused by closing the door. Easy and convenientSingle shower door slides are easy to install and move. Over time, if replacement is needed, simply replace the rollers. Many uses: Shower door rollers are bathroom replacement parts , suitable for shower enclosures, glass doors, bathtubs, glass doors, toilet glass doors, etc.