Curious little toddlers love to explore which can lead them into potentially harmful situations; especially around windows. Dreambaby Sliding Window Locks work by limiting a windows maximum opening distance. Suitable for use on most horizontal and vertical aluminium sliding windows. Easy to install with provided Allan Key or remove when not required. No drilling required. Designed to restrict opening distance of windows and doors to the recommended 10cm to reduce the risk of injury from falls. Allows fresh airflow Easily fitted to most horizontal & vertical aluminium sliding windows