Our Shower Door Sliding Rollers adopts electroplating plastic alloy which is not worried about rust, on the other side, while ensuring the strength of the shower door roller slides, the plastic alloy greatly reduces the risk of glass breakage due to collisions.Copper swing and stainless steel screws should make the product more durable.The height of the bottom wheel is adjusted according to the top wheel.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 specificationsWe 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