Material: Made of high-quality material, it can withstand greater pressure and is not easily damaged. Excellent Safety: High-quality accelerator cable for added safety, health, and protection in the home, and safety for babies/children. Easy to Install: Made of 19cm long steel wire, it comes with self-tapping screws and keys; only a screwdriver or drill is needed for installation. Wide Range of Applications: Perfect for PVC, aluminum, wood, and composite doors and windows. Use it on casement, tilt-and-turn, and sliding windows; balcony doors, guest room doors, etc. Locked and Unlocked: The special limiter design provides a 19cm restriction and fresh air, and the window can be fully opened when the cable at one end is pulled with the key. Once the cable is in place, the distance the window can be opened is limited. With the key, you can pull the cable at one end and open the window fully. New Shape: Smooth lines, can be bent as desired, cable length up to 18.5cm. Unique lock core, greatly increases door lock security. Package includes: 4 pieces