Package Contents: A set of 4 double shower door rollers (2 top and 2 bottom).Galvanized door rollers: top double shower door rollers and below (diameter) 23mm, electroplated surface, rustproof; suitable for glass door thickness from 4 to 10. 6mm, 13.5 14mm.These replacement shower door wheels fit up to 14mm. most shower rooms, shower rooms and steam rooms, and are fitted to the top and bottom of the shower door for easy opening and closing.There is no noise when opening the shower door, and these glass shower door rollers help it open. glide smoothly. Easy to install and maintain 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.