Specification Packing: 4PCS Material: plastic, metal Size: 45mm(1.77in)x35mm(1.38in) Feature Rugged and durable, not easy to break or deform, and have a long service life. Blinds, Roman blinds and similar curtains can be installed. They easily open and close the shadows by grasping and releasing the thread. Suitable for Roman blinds, which allows you to raise and lower Roman blinds like curtains, install them on the top bracket, and then pass the thread through, they will work well to make your blinds flexible and adjustable. Suitable for bamboo blinds and Roman blinds. Reminder: There are many sizes of blind locks, depending on how many wires are to be worn, please check the size on the picture before ordering to make sure it matches your blinds.