Electroplated door roller: 23 mm (diameter) wheels, electroplated surface, anti-rust; suitable for glass doors with a thickness of 4-6 mm, glass openings are 12-14 mm. These replacement shower door rollers are suitable for most shower rooms, shower rooms and steam room enclosures, and are installed on the top and bottom of the shower door to easy to open and close. There is no noise when opening the shower door, and these glass door rollers help it slide smoothly. It is easy to install and maintain. Surface treatment: electroplating Colour:Silver+white Material:Copper + nylon Size:Pulley diameter: 23mm Package Contents: 2 x top Shower door rollers 2 x bottom Shower door rollers Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.