Description Package Content: Set of 4 twin shower door rollers (2 pcs top and 2 pcs bottom).(recommended for 14mm glass hole) Galvanized Door Rollers: 23mm (diameter) top and bottom shower door double rollers, surface plated, anti-rust; Suitable for 4-6mm glass door thickness, 13.5-14mm glass open hole. These Replacement Shower Door Wheels are suitable for most shower enclosures, cabins shower doors and steam cabins, installed at the top and bottom of the shower door, for easy opening and closing. (recommended for 14mm glass hole) 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) Material Our Shower Door Sliding Rollers adopts electroplating plastic alloy which does not break. Dont worry about rusting, on the other side, while ensuring the strength of the shower door roller tracks, the plastic alloy greatly reduces the risk of glass breakage due to collisions. Copper swing and stainless steel screws should make the product more durable. Rollers at the top These shower door wheels fit thick glass 4-6mm and 13.5-14mm glass opening, 23mm wheel diameter, there are 4 extra anti-collision blocks to best protect your shower door. Adjust the height of the glass by screw. Rollers at the bottom The height of the wheel at the bottom is adjusted according to the upper wheel.