Made of high-quality material, able to withstand higher pressure and not easy to damage. Excellent safety with a high-quality choke cable for added safety, health, and safety at home and for baby or child safety. Easy to install: Made of steel wire measuring 19 cm long, comes with 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; balcony doors, guest bedroom doors, and more. Locked and unlocked function: Special limiting design provides 19 cm of restriction while allowing fresh air. The window can be fully opened once the cable is removed from one end using the wrench. When the cable is in place, the window opening distance is limited. Using the wrench, you can remove the cable from one end and fully open the window. New shape with smooth lines, flexible bending, and a cable distance of up to 18.5 cm. Unique locking core that greatly increases door lock security. Package included: 4 pcs