Loose Leaf Rings, often referred to as “metal book rings”, “binding rings”, and “loose leaf rings,” are made of nickel-plated steel. These metal rings are used to bind paper, swatches, and many other materials to create books, training guides, point of purchase displays, and more. The lock snaps open easily to insert punched materials, yet locks securely once it is closed- perfect for projects that may need to be modified at a later date.