Shower door rollers: 4 x 23mm rollers (2 top rollers, 2 bottom 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: 4-6mm, glass 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 alloy Quantity: 4 pieces (upper two rounds, lower two rounds) Size: Wheel diameter: 23mm, glass thickness: 4-6mm, glass opening: 12-14mm Features : Durable Material: The roller is made of ABS with zinc alloy. He is strong and brilliant. Roller accessories: The roller is fixed in place with screws and covered with a screw cap, making it beautiful and easy to clean. Area of application: 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, please feel free to contact us.