Assorted sizes: Comes with 60 loose-leaf book rings, 3 different sizes, enough for your spare or replacement. . Durable material: All keychains are made of nickel plated steel, hard and sturdy, not easy to break, you can use them for a long time. . Wide Application: The book binders lock securely and are ideal for securing stacks of documents, paper maps, name tags, keys and samples, loose sheets, memos, keyrings, sample racks, etc. . Easy to use: The metal steel rings can be split into two halves and are held together by a pivoting metal rivet in the center of the ring. Just pull to open and squeeze to close. . Sufficient quantity: 60 book bindings are available, enough for the office and the daily life. .