Material: Nylon Copper, Good Elasticity, Good wear resistan, corrosion resistance, rust prevention, of stable quality and has a long service life.Shower Door Rollers Size: Diameter of the wheel: 27mm; wheel thickness: 5.5mm. Suitable for 4-6 mm glass thickness. Total length: approx. 33 mm. For Glass Door Openings:10~12mm; 12mm recommended. Thickness: 4-6 mm. DIY replacement: It is easy and convenient for this door knob DIY replacement; you can simply disassemble it by screwdriver and replace with new rollers on glass doors. No Noise to open the shower door and these glass door roller help it slide smoothly. It is easy to Install and Maintenance. Installed on the top and bottom of shower door, to make it easy to open and close.Wide Application: For shower doors and massage cabins, bathtubs, Jacuzzi or any other furniture fittings. Suitable for most Shower Enclosures, Shower Cabins and Steam Cabin Enclosures. Package Include: Set of 8 rollers. Over time, the rollers need to be replaced. A Perfect Spare/Replacement. Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.