YuanQian Set of 4 Twin Shower DoorRollers 23MM (2pcs top and 2pcs bottom).
Suitable for most Shower Enclosures, Shower Cabins and Steam Cabin Enclosures
Easy Glide Eeplacement Shower Door Roller . From Picture Clearly see which Top /Bottom Roller
Glass Open-Hole: ¦8-13MM can be fit ; Pulley: 23MM GlassThickness: 4-6mm