1. Six-track design with double-track, double-row wheels for quiet and smooth operation, ensuring reliable load-bearing performance. 2. Bridge-type floor drain prevents rainwater backflow, with internal steps and external drainage. The double-row floor drain tracks slide smoothly for easy cleaning. 3. The frame and sash are fully recessed for complete concealment, and can be equipped with reinforced center columns and embedded components for enhanced stability for larger sashes. 4. Standard high-definition screen protects against insects and enhances visibility. 5. Hidden automatic side locks eliminate visible protrusions, creating a stylish and elegant design. 6. The screen is 2.5mm thick and can be installed inside or outside, with a one-piece bottom design for enhanced strength. 7. The closed, generously pressed design provides enhanced wind resistance and safety.
