Package Content: Set of 4 twin shower door rollers (2pcs top and 2pcs bottom).(Recommended for 14mm glass hole) Galvanized Door Rollers: 23mm(diameter) top and bottom shower door twin rollers, plated surface, anti-rust; Suitable for 4-6mm glass door thickness, 12-14mm glass open hole. These replacement shower door rollers are suitable for most shower enclosures, shower cabins and steam cabins, installed at the top and bottom of the shower door, for easy opening and closing.(Not fit for hole dia less than 12mm) No noise to open the shower door and these glass shower door rollers help it slide smoothly. It is easy to install and maintain.(Recommended for 14mm glass hole) Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.