Avery Heavy-Duty 3-Ring Binder With Locking One-Touch EZD Rings, 3" D-Rings, Black - This Avery heavy-duty binder with one-touch EZD ring technology holds up to 50% more than standard round rings that are the same size. The Gap Free design of the rings also helps prevent misalignments, making it easy to flip through pages of notes or documents.