Set of 4 New twin wheel Shower Door Rollers (2 upper and 2 lower)The distance between glass shower doors with 2 glass holes: about 26mmExcellent quality chrome plated coversDiameter of the wheel: 23mm; Width of the wheel: 5.5mm. Minimum Hole size in the glass: 11mm. Maximum glass thickness: 6mmthere is no Noise and Slide Smoothly.It is easy to Install and MaintenanceAbout Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact usDuring the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shoppingThanks for your cooperation and we'll make you feel satisfied.