This flexible door and window limiter is the perfect solution to provide limited window or door opening. Easy installation, specially designed to protect children from falling out of the window. Adding child safety to the window with safe and anti-theft opening; It also provides extra security, restricting how much the window can be opened prevents thieves from being able to use the window as an access point. Suitable for most types of windows and small doors. Perfect for domestic, public and commercial applications. Improve air circulation; Maintain child safety; Both use to keep the window closing and partial opening;Sliding Window Security Lock Stop Aluminum Alloy Door Frame Security Lock with Keys Features: Prevent children/toddlers/pets from falling The sliding glass door lock can keep the windows doors closets cabinets opened or closed to prevent your curious little kids/pets away from gaining access to unsafe area such as swimming pools, patios,balconies etc.allowing you to have peace of mind to keep your children stays safely inside. Prevent burglars and thieves Use these slider locks to prevent a window or sliding door from being forced open from the outside,add more security to your family! Improving air circulation Use the window locks to lock your window in an open,ventilated position to improve air circulation especially in hot summer! keeping the windows/doors partially open and closed Whether you want to keep your doors and windows firmly closed or keep them slightly opened for air circulation,you can count on our security door stops to make sure they stay firmly in place. Desciption: Name:plastic steel window lock Material:Zinc Alloy Size:As Picture Shows Package include: 1 * Plastic Steel Window Security Locks 1 * key