This is the Shower Door Rollers/Runners/Wheels/Pulleys 25mm wheel. Description: Diameter of wheels: 25mm Width of wheels: 5mm Minimum Hole size in the glass: 11mm. Materials: Plastic, Nylon, 304 stainless steel micro-bearing POM ABS brass axis – never rust Product Features: These rollers fit glass shower doors where the distance between the centre of the fixing hole and the edge of the glass is 18mm. The truck is held in place with a nut and this is covered with a plastic cover making them pleasing to the eye and easy to clean. Swivel action to also fit curved and quadrant showers. Package Included: 1X Shower Door Roller Notice: 1. Please measure the size before the purchase. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Please allow 1-2cm differs due to manual measurement !