Screw Lock Binding Rings are an easy and affordable method for binding materials that require frequent editing. Photo Albums, reports, fabric swatches, and point of purchase displays are only a few of the popular applications bound with these convenient and durable binding rings. You will be able to rest easy knowing that your documents will be bound securely with the sturdy screw lock straight edge featured on each ring. Book Rings are extremely easy to use and require no equipment. All you need to do is pull open, and screw shut.