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 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. Suitable for use on PVC, aluminum, wood, and composite doors and windows. Ideal for double-hung, casement, and sliding windows, balcony doors, guest bedrooms, and more. Features a special limiting design that allows 19 cm of window opening for fresh air while providing 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. Use the wrench to detach the cable temporarily for full window access. New design with smooth lines and flexible bending capability; maximum cable extension up to 18.5 cm. Equipped with a unique locking core that enhances door lock security. Package includes: 4 pieces