Shower Door Rollers: 4 rolls of 23 mm (2 upper rolls, 2 lower rolls). Installed at the top and bottom of the shower door.Roller material: The roller is made of ABS and zinc alloy. It is durable.Roller set: Each roller is equipped with a screw cap. It is easy to slide and clean.Glass hole size: roller suitable for glass thickness: 4-6 mm, lens opening: 12-14mm.Applicable scene: These shower door rollers are suitable for most shower rooms, it is convenient to open and close the shower door. Attributes:Material: ABS + zinc alloyQuantity: 4 pieces (two upper towers, two lower towers)Size: Wheel diameter: 23 mm, glass thickness: 4-6 mm, lens opening: 12-14mmFeatures:Durable material: The roller is made of ABS with zinc alloy. It is strong and shiny.Roller accessories: The roller is fixed in place with screws and covered with a screw cap, which makes it beautiful and easy to clean.< p>Field of application: The roller is suitable for flat sliding shower doors and curved sliding doors.Package includes:4 x Shower Door Rollers Tips:If you have any questions, please feel free to .Note : The data is manual measurement, please allow 1-113cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.< /p>