8 pieces shower door rollers single wheel, includes 4 upper rollers and 4 lower rollers. Great for replacing shower door rollers. Wheel diameter is 25 mm, wheel width is 6 mm. The minimum glass mounting hole is 11 mm, the maximum glass thickness is 6 mm. The distance from the center of the mounting hole to the edge of the glass is 25 mm. The shower door roller is made of brass rod and ABS plastic material, it is rust-resistant, sturdy and durable. Comes with screws and plastic covers. These single shower door rollers fit glass shower doors. The sliding door roller kit allows the door to slide smoothly and saves effort. A practical hardware for sliding glass shower doors. The bathroom roller is easy to move and install. It can also move the door to save space. Specification: Material: ABS plastic Size: Wheel diameter: 25 mm Maximum glass thickness: 5.5 mm The distance from the center of the mounting hole to the edge of the glass: 25 mm Suitable for most shower doors. Package includes: 4 pieces upper rollers for shower door 4 pieces lower rollers for shower door