What is binder ring?

Binder rings (also called loose leaf rings or book rings) are circular rings, typically made of metal or plastic, that are used to bind loose sheets of paper or other materials together into a cohesive document or project. They may be opened and closed with a clasp mechanism or a screw closure, allowing for easy access to the contents of the binder. These rings are commonly used in school and office settings, but can also be used for crafting or organizing personal papers. Binder rings come in various sizes, ranging from small rings that hold a few pages to larger rings that can hold hundreds of pages.