General description These replacement double casters are designed for sliding shower doors, providing a smooth and convenient operation. The set includes four rollers, with two for the top and two for the bottom of the door, ensuring stability and ease of use. Technical specifications Roller Diameter: 23mm Glass Thickness Compatibility: 4-6mm Glass Opening Size: 12-14mm Material: ABS and Zinc Alloy Quantity: 4 pieces (2 upper rollers, 2 lower rollers) Installation Each roller is fixed in place with screws. Comes with a screw cap for a neat appearance and easy cleaning. Usage Suitable for flat sliding shower doors and arched sliding doors. Facilitates easy opening and closing of the shower door. Other information Durable and easy to clean design. Strong and shiny finish.