Material: Shower door roller made of nylon and copper, sturdy and durable, stable in quality and have a long service life. wear-resistant wheels are smooth and low sliding noise. Suitable for: glass door thickness: 4 to 6mm. Dimensions of the hole in the glass: 10-12 mm.Wide Application: Shower Enclosure - Replacement castors for shower enclosures and massage enclosures, bathrooms, jacuzzi and even for furniture fittings. Thanks to our shower rollers, door and sliding systems can be easily and smoothly. Easy installation: Shower door rollers easy to move and install. For repair, only one screwdriver is needed. Product material: copper + nylon 1. Glass opening 10-12MM 2. Glass thickness 4-6MM 3. The diameter of the roller skate can be based on the size you are currently using Quantity delivered: 8 pieces Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it