8 single-wheel shower door rollers, including 4 upper rollers and 4 lower rollers. Ideal for replacing shower door rollers. The wheel diameter is 25 mm, its width is 6 mm. The minimum glass mounting hole is 11 mm, its maximum thickness is 6 mm. The distance between the center of the mounting hole and the edge of the glass is 25 mm. The shower door roller is made of brass rod and ABS plastic. It is rust-proof, sturdy and durable. Comes with screws and a plastic cover. These single shower door rollers fit glass shower doors. The sliding door roller set ensures smooth sliding and saves time. Practical fitting for sliding glass shower doors. The bathtub rail is easy to move and install. The door can also be moved to save space. Specifications: Material: ABS plastic Dimensions: Wheel diameter: 25 mm Maximum glass thickness: 5.5 mm Distance from center of mounting hole to edge of glass: 25 mm Suitable for most shower doors. Package Contents: 4 x Shower Door Upper Rollers 4 x Shower Door