Package Content: Set of 4 twin shower door rollers (2 pieces top and 2 pieces bottom). Galvanized Door Rollers: 23mm (diameter) top and bottom shower door twin rollers, plated surface, rustproof; Suitable for 4-6mm glass door thickness, 13.5-14mm glass open hole. These replacement shower door wheels are suitable for most shower enclosures, shower stalls and steam cabins, installed at the top and bottom of the shower door, for easy opening and closing. No noise to open the shower door and these glass shower door rollers help it slide smoothly. It is easy to install and maintain. Product Description Our Shower Door Sliding Rollers adopt electroplating plastic alloy which is not worried about rust, on the other hand, while ensuring the strength of the shower door roller slides, the plastic alloy greatly reduces the risk of glass breakage due to collisions. The copper swing and stainless steel screws are to make the product more durable. These shower door wheels fit 4-6mm glass thickness