The curved shower door roller is made of high-quality materials, anti-corrosion, sturdy, and durable for long service life. Includes 8 curved shower door rollers with a 23mm diameter: 4 top rollers and 4 bottom rollers. The pulley system allows for easy one-click removal and cleaning. 23mm diameter wheels fit glass doors 4-6mm thick. Upper and lower rollers are compatible with glass apertures of 12-14mm. The top roller height is adjustable up to 8mm via stainless steel screws. The bottom roller spring automatically adjusts to the top roller height. Designed for smooth, quiet operation, these rollers ensure effortless opening and closing of shower doors. Suitable for use in shower enclosures, bathtubs, and similar applications. Replacement rollers include bump blocks and mounting screws for easy installation and maintenance. Color: Silver Material: Plastic Package Contents: 4 pairs x pulleys 8 x anti-collision blocks 8 x screws Note: This package includes only the items listed. Other products are not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3cm.