Office workers, teachers, and anyone who deals with documents - this FLKQC 100-pack of binding combs is exactly what you need for professional-looking reports and presentations! Each comb has 21 rings with a 1/4 inch (6mm) diameter, designed to hold up to 20 sheets of A4 paper (that's 8.27x11.69 inches). The plastic construction is durable yet flexible, making it easy to add or remove pages as needed. These combs work with any standard 21-ring comb binding machine, so they're compatible with most office binding systems. The black color looks professional for business documents, school projects, reports, manuals, or any important papers you need to organize. With 100 combs in the package, you've got plenty for multiple projects or to share with colleagues. The spines can even be cut with scissors to custom lengths if you're working with smaller documents. Perfect for binding business plans, office documents, family schedules, school workbooks, restaurant menus, or presentation materials. The smooth incision design makes opening and closing the combs easy without damaging your documents. Whether you're preparing reports for a meeting, creating training manuals, organizing student work, or just want to give your documents that polished, bound look, these binding combs deliver professional results at an affordable price. It's one of those office supplies that instantly makes your work look more put-together and organized.