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Loose leaf rings made of tough steel can withstand heavy use. Coideal book ring is ideal for fastening any size document stack,especially large size.The metal rings are made of high-quality steel and can withstand heavy use.The steel rings are good to organize loose leaf books flashcards or any punched materials. You can also use the book rings for keeping jewelry.Made of heavy duty steel and have multilayer nickel plating on the surface which will not crack, rust or split easily.Dimension: Inner diameter:3inch Line diameter:0.144inch Outer diameter:3.144inch