Made of high-quality material, designed to withstand higher pressure and resist damage. Provides excellent safety with a durable choke cable, ideal for home safety and childproofing. Easy to install with steel wire measuring 19 cm in length, includes self-drilling screws and wrenches; requires only a screwdriver or drill for setup. Suitable for use on PVC, aluminum, wood, and composite doors and windows. Ideal for double-hung, casement, and sliding windows, as well as balcony doors and bedroom doors. Features a special limiting design that allows 19 cm of controlled opening for fresh air while restricting full access. The window can be fully opened by removing the cable from one end using the included wrench. Cable can bend freely with a maximum distance of 18.5 cm. Equipped with a unique locking core to enhance door security. Package includes: 4 pieces.