Enhanced Safety: Window limit locks are primarily designed for child safety, restricting the opening distance of windows to effectively avoid the risk of children or infants falling out of windows. They also provide some protection against intruders while allowing for proper air circulation between indoor and outdoor spaces, ensuring both safety and ventilation needs are met Premium Texture: The window limit lock is crafted from premium zinc alloy and UPVC, which are robust and resistant to rust. It can withstand significant pressure and is unlikely to be damaged, providing additional safety protection for infants, children, pets, and those living alone, thereby enhancing home security Wide Application: This window lock is suitable for most types of windows and small doors, and can be widely adapted to various textures like UPVC, wood, aluminum, and metal, meeting safety needs in residential, public, and commercial settings, making it an ideal safety lock Set Includes: This set includes 4 child safe window limit locks and 4 keys. The white safety lock design adds an elegant to windows while effectively enhancing home safety, making it an ideal choice for improving residential security Easy Installation: This window lock can be locked and unlocked, offering flexible use. When the cable is in position, it limits the window's opening distance, after removing the cable with a key from one end, the window can be fully opened, meeting the needs of different usage scenarios