[Product Name]: Shower room swinging double wheels [Material]: Nylon wheel + sealed bearing Wheel brackets are copper and aluminum, body and trim cover are plastic [Specifications]: Upper wheel-swing double wheel can be fine-adjusted Lower wheel-swing double wheel with spring [Glass thickness]: Suitable for 4mm-8mm thick glass doors [Glass hole diameter]: 10MM-14MM required [Wheel diameter]: 25MM [Scope of use]: Both flat and arc-shaped shower rooms are available 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 25mmExcellent 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 Maintenance About 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 us During 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 shopping Thanks for your cooperation and we"ll make you feel satisfied.