KiHomy Aluminum Slide Patio Home Doors Windows Bolt Locking Catch Push Security protection Tools (silver) Safety: To prevent children from accentual falls avoid accidental opening of children accidentally window Security: To prevent burglary, it can lock the window when the window ajar. Ventilation: Keep ventilated, fresh indoor air. Appearance: Professional surface treatment, fastness, concise and beautiful; Use high-quality materials, easy to open, suitable for any Aluminum slide doors and windows. Locking do not need the key but open.