Made of high-quality material, able to withstand higher pressure and not easy to damage. Excellent safety features with a high-quality choke cable for enhanced home and child safety. Easy to install with steel wire measuring 19 cm in length, includes self-drilling screws and wrenches; requires only a screwdriver or drill for installation. Widely used for PVC, aluminum, wood, and composite doors and windows. Suitable for double-hung, casement, and sliding windows, as well as balcony and bedroom doors. Features a special limiting design that allows 19 cm of window opening for fresh air while maintaining security. The window can be fully opened by removing the cable from one end using the included wrench. When installed, the cable limits the window opening distance. New design with smooth lines and flexible bending capability, with a maximum cable distance of 18.5 cm. Equipped with a unique locking core that significantly enhances door lock security. Package includes: 4 pcs