A binder ring refers to a circular metal or plastic object used to hold together sheets of paper in a binder. It is often used to easily organize and flip through pages in a document or notebook. Full definition
Placing the equation boards on a loose leaf binder ring for students to choose the board they want to work on. (teachingwithsimplicity.com)
Supplies: — white paper lunch bag — skin tone paint — paintbrush — black, red, blue and white cardstock paper — small binder ring — googly eyes — markers — scissors — glue (iheartcraftythings.com)
Make your notepads and notebooks using leftover paper held together with binder rings or a metal paper clip. (treehugger.com)