Material: ABS + zinc alloy. Delivered with screw cover. Easy to slide on and clean. Dimensions: suitable glass thickness: 6-8 mm, wheel diameter: 26 mm, diameter of the hole in the glass: 10-14mm. Screw Caps: The truck is held in place with a screw and this is covered with a chrome plastic cover making it easy on the eye and easy to clean. Scope of application: suitable for flat sliding shower doors and sliding shower doors. Set of 4 upper shower door rollers and 2 door rollers shower head. Features: Color: As the picture shows. Material: ABS + zinc alloy. Suitable glass thickness: 6-8 mm. Diameter of the hole in the glass: 10mm-14mm. Wheel diameter: 26 mm. The center of the glass hole at the bottom of the glass: 15-17 mm. Contents: 2 upper pulleys. 2 lower pulleys. 4 protection blocks.</ p> 4 screws. lucky meet Note: The data is all measured manually, please allow 1-3cm error, due to the light and display difference , there will be a certain color difference, the actual object received shall prevail.