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Metal opening O-rings are sometimes called “binder rings”, because they are most commonly found on school notebooks. Instead of a welded seam on top, these O-rings have a latch allowing you to open and close them around what you are working with. These 2 inch nickel plated opening O-rings are commonly used as key rings, mobile Rolodex flippers, and quick release connectors between runs of webbing. They can also be used to secure swatch books and color reference charts, or be used to hang and display things like shower curtains and various types of light-duty decorations.