Size: The roller diameter is 25mm and the thickness is 5.5mm. Total length: about 30mm, suitable for glass door hole diameter 10-12mm, door thickness 4-6mm. Please check the diameter of the old shower roller and the thickness of the glass door before buying. 25mm shower door wheels, replace old rusty rollers, repair your glass door and keep sliding smoothly. Material: Made of nylon and copper. Provides good elasticity and abrasion resistance. Compatibility: Recommended for 12mm thick glass doors. Suitable for shower doors, massage rooms, bathtubs, jacuzzi, or other furniture. Reminder: Before installing the shower door roller, apply silicone grease to the surface of the roller to prolong its service life. Size: Diameter 25mm. Color: As pictured. Quantity: 8 pieces.