These triangular book corner protectors not only protect book corners from damaging,but also serve as a retro beautiful decoration. Metal corners are widely used for craft and DIY projects such as making scrapbook,photo album,menus,jewelry boxes,wallets,cards,and so on. It's an useful accessory for your daily life.SpecificationMaterial: IronSize: 22x22mm / 0.87x0.87 inchInner height: 4 mmPackage list: 100 pcs Metal Book CornersAdvantageMetal book corners are made of quality iron,which is rust-proof,durable,anti-corrosion,round and smooth,flat and burr-free,will not make scratches on the book.Instruction Just insert them into the book cover and press the metal book corners to fasten it firmly to the book for a great look and good protection.