Size: The diameter of the wheel rollers is 25 mm, its thickness is 5.5 mm. Total length: approx. 32mm Suitable for 10-12mm diameter glass door hole and the door thickness is 4-6mm. Please check the diameter of your old shower rollers and the thickness of your glass door before purchasing. 25mm Shower Door Wheels - Come with 8 PCS rollers to replace the old rollers rusted, to repair your glass door and keep sliding smoothly. Material: Made of nylon and copper. Provide good elasticity, good wear resistance. Compatibility: 12mm thick glass door is recommended. For shower doors and massage cabins, bathtubs, jacuzzi or any other furniture. Tips: Before installing the shower door rollers, please apply silicone grease (packaging not included) on the surface of the glass door rollers to prolong its service life.