General description This set of 4 double shower door wheels features 23mm rollers designed for sliding shower doors. Made from high-quality nylon and zinc alloy, these pulleys are durable and wear-resistant, ensuring smooth operation. Technical specifications Material: Nylon and zinc alloy Roller diameter: 23mm Suitable for glass doors thickness: 4-8mm Upper roller: Without spring, adjustable by rotating the screw Bottom roller: Built-in buffer spring Installation Install the upper roller first, followed by the lower roller. The diameter of the glass opening should be greater than 12mm. The distance between the upper wheel opening and the top of the glass should be less than 12mm. Usage Each shower door requires 4 rollers, and it is recommended to replace them in pairs for optimal performance. Other information