With this binder mechanism spine, your loose leaf planner more neat and give it a new look. Sturdy metal materials make it have , can be used for a longer time without being easily damaged. Suit for personal binder planner. Features - ColorGolden -Material:Metal - Size: 12.60X3.00X2.00cm/4.95X1.18X0.79in -binder ring inner diameter: 20mm -binder ring hole distance: 80mm - 2 ring binder spine is compatible with most loose-leaf planner. Easy to install and remove. - 2-hole design, providing flexibility in binding options. Easy for you to add or remove pages, which is very convenient. - The binder mechanism the perfect addition to your loose leaf notebook diy making. - 2 ring binder spine is perfect for diy enthusiasts looking to personalize their planner or notebooks. - 2 ring loose leaf binder mechanism, make your book lock firmly, sturdy and not easy to fall off. Package list: 1 x binder mechanism