Shower Door Rollers, Sliding Shower Door Wheel Replacement, Roller Runner Wheel for Shower Doors. These 23mm diameter top and bottom shower door rollers feature a plated surface and are rustproof. Designed to fit glass doors with a thickness of 4-6mm and glass open-hole size of 10-12mm. Recommended for glass hole size of 11-12mm; not suitable for holes under 10mm. These replacement shower door rollers are compatible with most shower enclosures, shower cabins, and steam cabins. Installed at the top and bottom of the shower door to ensure smooth sliding operation. Provides quiet and smooth opening and closing performance. Easy to install and maintain. Color: Blue. Size: Diameter 23mm. Quantity: 4 pieces. Note: Due to different measuring methods, there may be a 1-3mm deviation in measurements. Please confirm the size before ordering. Due to variations in monitors and lighting, the actual color may differ slightly from the image. Package includes only the items listed, other products are not included.