With Lock And Key: Includes a dual-sided key lock system (operable from both inside and outside) for quick opening in emergencies to facilitate escape. The 10 cm (4") bar spacing is designed to help deter intruders and provide an added layer of security for your home Foldable Window Security Bars: Our security window is equipped with pulleys for smooth sliding and folding adjustment. When closed, the bar spacing balances ventilation and natural light. When not in use, it folds sideways against the wall to save space and facilitate window cleaning Aluminum Guard Window: The frame features a mortise and tenon structure, providing sturdy stability and withstand impacts, strong winds, and other external forces. The surface is treated with spray coating, offering weather resistance and long-term adaptability to outdoor environments Customizable Size: Window guards are available in multiple specifications and can be customized. You can select the required size based on your home needs, with different styles to choose from, meeting the demands of most households Wide Applications: Suitable for children's rooms, bedrooms, lofts, basements, garages, hotels, offices, warehouses, apartments, dormitories, schools, farms, sheds; compatible with most door and window sizes