Shower door rollers: 4 rollers of 23 mm (2 upper rollers, 2 lower rollers). 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: 12-14 mm.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 alloy Quantity: 4 pieces (two upper rounds, two lower rounds) Size: Wheel diameter: 23 mm, glass thickness: 4-6 mm, lens opening: 12-14 mm Features: 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, making it beautiful and easy to clean. Application area: The roller is suitable for flat sliding shower doors and arched sliding doors. Package includes: 4 x shower door rollers Tips: If you have any questions, do not hesitate to contact us.