KTOJOY 3 Inch (12 Pack) Loose Leaf Binder Book Rings, with Metal Nickel Plated for Key,and Index Cards, for School, Home, or Office, Silver

Great Material: Loose leaf ring is made of iron material, strong and serviceable, Multi-layer nickel-plated steel rings prevent rusting, color unfading, Size: 3 inch , 80 mm diameter (outer ring), hold up to 175 sheets; 12 pieces loose leaf rings,hold up to 700 sheets of 20 lb paper, Easy to Operate: Convenient to use just pull to open and squeeze to close; the misalignment occurred after opening, because the binder ring itself did not use spring or other elastic devices, in order to make the bite tightness after closing more tightly, so this design was used, Wide Application: Binder Rings are suitable for loose-leaf, memo filing, key rings, scrapbook, binding recipe, photos, book, sample book, scrapbook, contract or file