Bilipala 10 Pcs Loose Leaf Binder Rings Book Ring Keychain, Silver, 1.5-Inches One package includes 10 silver loose leaf binder rings. The metal book rings are great for variety of uses such as loose-leaf, memo filing, and sample holders. The loose leaf rings made from multi-layer nickel-plated steel that will not crack or split. The book ring can also be used as a keychain. Diameter: inside diameter: 1.50 inches, outer diameter: 1.77 inches.