Material Made from high-quality materials, designed to withstand higher pressure, ensuring durability. Excellent Safety High-quality choke cable enhances safety, promoting health and safety at home, especially for children. Easy to Install Constructed with steel wire measuring 19cm in length, includes self-drilling screws and wrenches; installation requires only a screwdriver or drill. Widely Used Suitable for PVC, aluminum, wood, and composite doors and windows. Applicable for double-hung, casement, and sliding windows; balcony doors, guest bedroom doors, and more. Locked and Unlocked Special limiting design allows for 19cm of restriction while providing fresh air, with the capability to fully open the window by pulling out one end of the cable using the wrench. When the cable is engaged, it limits how far the window can open. By using the wrench, the cable can be removed from one end, enabling full window access. New shape with smooth lines, flexible bending, cable distance up to 18.5 cm. Unique locking core significantly enhances door lock security. Package included: 4Pcs