High quality material: the shutter curtain thread lock is made of plastic and metal, durable, not easy to break or deform, surface, no scratch, not easy to break or deform, can be used for a long time. It is widely used in your life and can bring you a lot of convenience. It is a for blinds. These locks are perfect for blinds, and they work well when mounted on brackets to make your screen flexible and adjustable, and they can easily open and close shadows by holding and releasing the line. Wide application: used for aluminum blinds and plastic blinds. It is suitable for home, shop and office. Easy to install: the shutter cord lock is easy to use, only need to install in a few minutes, the installation process is fast and simple, and can easily complete the replacement or maintenance project, this is the best solution for you to choose the maintenance clip.