Metal Book Rings Size: 0.75 inch / 19 mm diameter (outer ring), 50 pieces loose leaf rings, can meet you daily needs
Premium Material: made from strong and durable metal, multi-layer nickel-plated steel to prevent rusting, color unfading
Easy to Use: just pull to open and squeeze to close, it will stay tightly closed once you close
Multipurpose: suitable to bind documents, or to link together a multitude of different materials; Great for loose-leaf, memo filing, keychain, key rings, scrapbook, binding recipe, photos, book, sample book, contract or file