Shower door rollers 23 mm, 4 pieces Package Content:Set of 4 Twin Shower Door Rollers (2 pcs top and 2 pcs bottom) and 4 rubber anti-collision block and 4 screws. Installed at the top and bottom of the shower door, for replacement shower door rollers Sturdy and Durable:The Shower Door Roller/Shower Enclosure Rollers are made of zinc alloy high quality and made of brass, nylon. It is durable, waterproof and rustproof. It will not be affected by the humid environment of the shower Silent Roller: The shower door roller is made of nylon, which can rotate along the central axis. Whether it is a normal bathroom door or a curved bathroom door, it can be pushed and pulled smoothly, and it is not easy to make noise Roller Diameter:Shower door wheel up and down 23mm (diameter), shower door rollers suitable for glass door thickness 4-6mm, glass open hole 12 to 14mm Applicable Scene:These Shower Sliding Door Rollers are suitable for most shower enclosures, shower stalls and steam rooms, it is convenient to open and close the shower door< /p>