1.【METAL LOCK SECURELY】The book binder rings are metal, smooth and shiny, prevent rust, strong stretch and safety buckle design. 2.【EASY to USE】 These Loose Leaf Rings just to pull to open and squeeze to close, tight lock-in design makes your books organized, not scattered after collapse. 3.【SIZE】These book binder rings are made of iron, strong, color unfading ,durability and repetitive use, no crack or bend. 4.【GREAT APPLICATION】The book binder rings suitable for classroom, company, office or home to fastening document stack, books, paper, photo album, keys, shower curtain hooks, scrapbook , cards, booklets , loose-leaf rings, memo filing, key rings, binding recipe, sample book, sample holders, contract or file etc. 5.【Steel Metal Round Rings】Can be split into two halves and held together by a metal swivel rivet in the center of the ring 1.【METAL LOCK SECURELY】The book binder rings are metal, smooth and shiny, prevent rust, strong stretch and safety buckle design. 2.【EASY to USE】 These Loose Leaf Rings just to pull to open and squeeze to close, tight lock-in design makes your books organized, not scattered after collapse. 3.【SIZE】These book binder rings are made of iron, strong, color unfading ,durability and repetitive use, no crack or bend. 4.【GREAT APPLICATION】The book binder rings suitable for classroom, company, office or home to fastening document stack, books, paper, photo album, keys, shower curtain hooks, scrapbook , cards, booklets , loose-leaf rings, memo filing, key rings, binding recipe, sample book, sample holders, contract or file etc.