Made of high-quality material, able to withstand higher pressure and resistant to damage. Excellent safety performance with a high-quality choke cable designed for home safety, including baby and child safety. Easy to install; constructed with steel wire measuring 19 cm in length and 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 doors and guest bedroom doors. Features a special limiting design that allows up to 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 provided wrench. When installed, the cable limits the window opening distance. Use the wrench to detach the cable from one side for full window access. New design with smooth lines and flexible bending capability; cable extends up to 18.5 cm. Equipped with a unique locking core that significantly enhances door lock security. Package includes: 4 pieces