1. Size: wire diameter: 3 mm/0.11 inch; ring outer diameter: 38 mm/1.5 inch2. Advantages: the loose-leaf binder ring is made of metal material with electroplated surface, smooth colour, rust-proof and reusable. The rings are designed with clasps for easy opening and closing, allowing you to sort and bind the loose-leaf pages freely.3.Instructions for use:Open the binder in the opposite direction and split the binder into two halves.2. Insert the loose-leaf ring into the snap hole. Secure the loose-leaf binder and close the binding ring.4. Application: The binder ring can be used to hold flip chart cards, menus, album pages, stamp albums, journals and other DIY crafts for easy flipping. The flipchart binder can also be used as an organising ring and holder for small items to avoid loss.5.Note: Please choose the right size according to your needs.