Shower Door Rollers, Set of 8 Single Shower Door Runners/Wheels/Pulleys/Guides 23mm Diameter Home Bathroom DIY Replacement Parts(4 Upper Rollers and 4 Bottom Rollers)

plastic+zinc alloy | A Set of 8 Pcs Single Shower Door Rollers (4 upper rollers and 4 bottom rollers). | Diameter of the wheel:20MM/22MM 23MM /25MM/27MM Can Choice | Width of the wheel: 6mm. Minimum Hole size in the glass: 11mm. Maximum glass thickness: 6mm. | Material: Plastic, Nylon, A Plastic, Nylon BS and stainless steel. | Comes with screw cover caps. Spring loaded action can also fit curved showers. Designed with a nut and a plastic cover