Features: Adopting premium brass shaft and ABS material, it is rust resistant, sturdy and durable in use. Make the sliding of door smooth and effort-saving. Fit for glass door in thickness about 4~8mm. Compatible with glass mounting hole diameter between 12~15mm. A practical hardware for sliding glass shower door. Specification: Condition: 100% Brand New Material: Brass + ABS Color: as Shown in the Picture Diameter: approx. 20mm, 23mm, 25mm, 27mm (Optional) Glass Mounting Hole Diameter: about 12-15mm Glass Thickness: about 4-8mm Weight: approx. 145g / 5.11oz Package List : 8 * Shower Door Rollers Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.