Multi-layered nickel-plating won"t crack or split. Locking position for extra security. Easy to operate--pull to open and squeeze to close. Tough steel rings can handle heavy use. Ideal for keys and swatches too! Global Product Type: Loose-Leaf Book Rings, Ring Size: 2 in, Ring Material(s): Nickel-Plated Steel, Quantity: 50 per box.