MyLifeUNIT Book Rings, Loose Leaf Binder Rings, 50 Pack (1.2 inch) Leaf binder rings for book, 50 PCS per pack, 1.2 inch / 30 mm diameter (outer ring) Nickel plated surface, durable, color unfading, rust proof Used for binding recipe, photos, book, sample book, scrapbook, contract or file Tight lock-in design, secure, easy to operate Metal material, could hold heavy stuffs, could serve as key ring