Material Made of high quality material, it can withstand higher pressure and is not easy to damage.Superior Safety High quality choke coils increase the safety, health and safety of the home and the safety of the baby/child.Easy to install Made of 20cm long wire with self-drilling screws and wrench, just a screwdriver or drill can be installed.Ideal for a wide range of PVC, aluminum, wood, composite doors and windows. For double-hung, casement and sliding windows; balcony doors, guest room doors, etc.Locked and Unlocked special limit design provides 20cm restriction and fresh air, use a wrench to pull the cable out of one end to fully open the window.White colorWhen the cable is in place, there is a limit to how far the window can be opened. Using a wrench, you can remove the cable from one end and fully open the window.New shape, smooth lines, can be bent at will, and the cable distance can reach 20 cm.Unique lock cylinder, which greatly increases the security of the door lock