Package Contents: A set of 4 double shower door rollers (2 up and 2 down). Galvanized door roller: upper and lower double shower door roller (diameter) 23mm, electroplated surface, rustproof; suitable for glass door thickness 4-6mm, glass opening 13.5-14mm. These replacement shower door wheels are suitable for most shower rooms, bathrooms showers and steam rooms, and are installed at the top and bottom of the shower door for easy opening and closing. There is no noise when opening the shower door. shower, and these glass shower door rollers help it slide smoothly. It is easy to install and maintain. Applicable Materials Our shower door pulleys are galvanized plastic alloys, so there is no need to worry about rust. On the other hand, while ensuring the strength of the shower door pulleys, the plastic alloys greatly reduce the risk of glass breakage due to collisions. The copper swing and the screws in stainless steel should make the product more durable Due to manufacturing, there may be 0.5-1mm error, but 13.5-14mm glass hole is a problem common with most of our shower door rollers. If you are unsure of the size of the glass opening, it is recommended that you manually measure the diameter in two steps. These shower wheels are ideal for sliding glass doors, patio doors and bathroom doors. Suitable for most shower rooms and steam rooms. Package includes: 4 * bath door roller (2 * upper wheel + 2 * lower wheel) We only sell rollers, the rest are props 1. Manual measurement, there will be errors in the size, please refer to the actual size 2. Due to the light and screen difference, the product color may be slightly different from the picture.