Loose Leaf Binder Rings are small metal rings designed for various uses. With a 2-inch inner diameter, these binder rings are perfect for organizing loose leaf papers, documents, and other materials. They can also be used as key rings, providing a convenient way to keep your keys organized. Made from durable metal, these book binding rings ensure long-lasting use. Easy to Operate The key ring binder open and close easily, lock for extra security, easy to operate, pull to open and squeeze to close. Closed tight, not scattered after collapse Book Rings Size 2.2 inch/56 mm diameter (outer ring); 2 inch/50 mm diameter (inside ring). Package 6 pieces loose leaf rings, can meet you daily needs.