General description Shower Door Rollers are designed for both top and bottom installation, suitable for sliding shower doors in enclosures. This set includes 4 pieces: 2 rollers for the upper shower door and 2 for the lower shower door. The upper rollers feature adjustable screws for precise positioning, while the button rollers come with dampening springs for secure mounting. Technical specifications Wheel diameter: 23 mm Material: Heavy duty zinc alloy Wheel type: Smooth ball bearing and wear-resistant nylon wheel Compatibility and accessories Compatible with flat sliding shower doors Compatible with curved sliding shower doors