This set of 8 single shower door rollers includes 4 upper rollers and 4 lower rollers. Suitable for replacing shower door rollers. Wheel diameter: 23 mm, wheel width: 6 mm. Minimum mounting hole: 11 mm, maximum thickness: 6 mm. The distance between the center of the mounting hole and the edge of the glass is 18 mm. The shower door rollers are made from brass rods and ABS plastic, making them rust-resistant and durable. They come with screws and plastic caps. These single rollers are suitable for glass shower doors. This sliding door roller set ensures smooth and effortless sliding. A practical accessory for sliding glass shower doors. This shower rail is easy to move and install. It also allows you to move shower doors, saving space. Description: Specifications: Material: ABS plastic Dimensions: Wheel diameter: 23 mm Wheel width: 6 mm Minimum mounting hole: 11 mm Maximum thickness: 6 mm Distance between the center of the mounting hole and the edge of the glass: 18 mm Compatible with most shower doors. Contents: 4 upper rollers 4 lower rollers