Made of high-quality material, able to withstand higher pressure and not easy to damage. Excellent safety performance with a high-quality choke cable for added home safety, ideal for baby and child safety. Easy to install, made of 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 doors and guest bedroom doors. 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 the cable is installed, it limits the window opening distance. Use the wrench to detach the cable from one end for full window access. New design with smooth lines and flexible bending capability, with a maximum cable extension of 18.5 cm. Equipped with a unique locking core that significantly enhances door lock security. Package included: 4 pieces