Available Ring Styles: "O" Rings, "D" Rings

O Rings:

To determine the capacity of a ring binder, measure across the INSIDE
diameter of the rings. The overall size of the rings must be larger than the
stated capacity because the metal mechanism must go around the contents.

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D Rings:

To determine the capacity of a ring binder, measure across the INSIDE
diameter of the rings. The overall size of the rings must be larger than the
stated capacity because the metal mechanism must go around the contents.

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