Wide Range of Applications: This baby safety window locks is suitable for use on windows and small doors made of UPVC, wood, aluminum, metal, and other materials in homes, schools, offices, and public places to create a safe environment for your children and other family members. Easy to Install: Each restrictors windows locks set comes with 4 screws and can be installed with a screwdriver or drill, providing extra protection for your children's safety. Quick and Convenient: The 180mm long window restrictor locks have a special restriction design that allows for easy opening and closing with a universal key. Safe and Durable: The Window Restrictor is made of strong and anti-damage materials, including iron connectors, stainless steel wire ropes, and zinc alloy lock bodies. The window restrictor locks can withstand greater pressure without being damaged and can be used for a long time. Effectively protect the safety of child and family members, and avoid loss of family property. Complete Set: Includes 12pcs window restrictor locks with keys and screws for easy installation on most doors and windows, to provide a safe environment for your children and anti-theft.