Package Content: A set of 4 double shower door rollers (2 top and 2 bottom). Galvanized door rollers: upper and lower double shower door rollers (diameter) 23mm, electroplated surface, rust-proof; suitable for glass door thickness 4-6mm, glass opening 12-14mm. These shower door replacement wheels are suitable for most shower rooms, shower rooms and steam rooms, and are installed at 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 slide smoothly. It is easy to install and maintain. Delivery quantity: 4* pulley