A. The multi-ring binder mechanism replacement kits are made of sturdy metal material, durable and practical for long - term use. B. The binder ring mechanisms are made with meticulous workmanship, and the color is not prone to peeling off. C. They are very suitable for binding various types of documents, invoices, personal planners, etc. D. Features: - Color: Silver - Material: Iron - Size: 30.50X2.50X2.00cm/11.99X0.98X0.79inch E. This ring binder mechanism is suitable for loose - leaf notebooks and planners. It is suitable for many people, such as those who use office supplies, teachers, etc., for various applications. F. These book binder ring mechanisms are made of iron material, which is durable and has high hardness. G. It can help collect loose sheets and is widely used in daily life and work. H. The multi - ring design ensures that these binding mechanisms are stable and sturdy and can be used for a long time. I. They are lightweight and portable, and can be used at home, in the office, and other places.