Description: Material: Made of premium quality metal, rings won't crack, split or bend. Easy to Use: Open and close easily and lock for extra security, some may be tight, but if you are patient and careful, you will definitely open it. Since it is openable round ring ,so it also could be key rings ,sample holders ,color cards rings ,and other items holders. Suit for loose leaf notebooks ,books ,album ,memo ,journal ,scrapbooking and other documents papers with holes. Application: you can drill holes according to your own needs. Ideal for make your own DIY travel notebook, photo album and personal organizers, scrapbooking, planner and more. Specification: Material: Metal Color: Silver Size Chart: Size: Approx. 70 mm / 2.95 inch Size: Approx. 75 mm / 2.76 inch Size: Approx. 32 mm / 1.26 inch Size: Approx. 60 mm / 2.36 inch Size: Approx. 50 mm / 1.97 inch Size: Approx. 20 mm / 0.79 inch Size: Approx. 14 mm / 0.55 inch Size: Approx. 38 mm / 1.50 inch Size: Approx. 80 mm / 3.15 inch Size: Approx. 25 mm / 0.98 inch Package Includes: 10 Pieces Book Ring (75mm,70mm,80mm) 20 Pieces Book Ring (60mm,50mm,38mm) 30 Pieces Book Ring (32mm,20mm,14mm,25mm) Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may be 1-2mm error in size.