4 Pcs Window Restrictor Locks for windows and doors, designed to limit opening while allowing ventilation and easy full opening when needed. Key benefits Controlled opening: Limits window or door travel to approximately 18.5 to 19 cm, allowing fresh air while preventing a full opening. Added security: Locking core increases resistance to tampering and improves overall security of the window or door. Durable construction: High quality steel wire and robust components withstand higher pressure and resist damage. Quick release for full access: Pull the cable out from one end with the supplied wrench to fully open the window when required. Features Material: High strength steel cable and metal fittings for reliable performance. Dimensions: Cable measures 19 cm in length; effective restriction distance up to 18.5 cm. Installation: Includes self-drilling screws and wrench; requires a screwdriver or drill for mounting. Compatibility: Suitable for PVC, aluminum, wood, and composite windows and doors. Works with double hung, casement, and sliding windows, as well as balcony and interior doors. Operation: When the cable is engaged, the opening is restricted. Use the wrench to remove the cable from one end to release the restriction and open fully. Typical applications Balconies and upper floor windows to provide ventilation while reducing the chance of a child or pet opening the window fully. Guest rooms or rental properties where a controlled opening is preferred for ventilation and occupant safety. Sliding and casement windows in homes, apartments, offices, and childcare facilities where controlled access is required. Package contents 4 pcs window restrictor locks Installation hardware including self-drilling screws and wrench included Note: Follow local building codes and best practices for placement and installation. Use appropriate tools and fixings for the window or door material.