Wilson jones Boomerang sheet lifter for three-ring binder Boomerang Sheet Lifter for Three-Ring Binder, Black Protects your pages and allows them to be easily lifted over the rings in your binder. Without sheet lifters, pages can get trapped under the rings causing them to be wrinkled or curled. Holes fit any style three-ring binders. For D-Ring binders, place one sheet lifter on top of contents. For round ring binders, place one sheet lifter on top and one below contents.