It limits the distance a window can open, ideal for private, public and commercial security, also specifically for the safety of children.Can be locked and unlocked as needed --- With the cable in place, the window is limited in distance to open. And the window can bFully opened after removing the cable from one end by using the button.Wide appCATion -SUITABLE for most kinds of windows and small doorSUITABLE for many kinds oMaterials such as UPVC, wood, aluminum and metal.Package including --- 4 x window security lock<Material --Made of high qualitMaterial, can withstand larger pressure, not easy to damage.Color whiteSuitable for: UPVC, wood, aluminum and metal.Can be locked and unlocked as neededSelf-drilling screws included.The lockable cable window restrictor is an easy-to-assemble device that limits the distance a window can open, ideal for home and commercial security.Specially designed for the safety of childrenSuitable for most types of windows and small doors.Prevents deaths and injuries. Perfect for private, public and commercial appCATions.Scope of delivery:4 x window and door safety limiters4 x keys per cable