Chris-Wang 40Pcs Silver Tone Metal Loose Leaf Binder DIY Photo Album Key Rings Book Calendar Circle, Assorted Size (9/16",0.75",1",1.25",1.5",2",2.5",3" Dia) Package included: 40Pcs book rings (with 8 different sizes in, each size has 5pcs) Binder rings lock securely; made of tough steel can withstand heavy use; strong nickel plating won't crack, split or bend Ideal for fastening any size document stack and keys and swatches too Rings open and close easily and lock for extra security Snap lock closures