metal ring binder with various colors, stationery ring binder of various sizes, notebook binder item name: binding coil material: iron/metal color: various. red, black, white, etc. can be customerized size: different sizes available according to different needs single ring, double ring for choose metal binding coil/meta binding spiral coil/double ring coil inner diameters vary from 6mm to 51mm spiral binding coils also available metal single-ring coil plastic single-ring coil inner diameter MAX binding thickness loop distance inner diameter MAX binding thickness loop distance inch MM MM MM inch MM MM MM 1/4 6.4 3.4 68 1/4 6.4 1.27 58 5/16 7.9 4.9 5/16 7.9 3/8 9.5 6.5 3/8 9.5 1.57 7/16 11.1 8.1 7/16 11.1 1/2 12.7 9.7 1/2 12.7 1.78 9/16 14.3 11.3 9/16 14.3 5/8 15.9 12.9 5/8 15.9 3/4 19.1 15.1 3/4 19.1 7/8 22.2 18.2 7/8 22.2 2.29 1 25.4 20.4 1 25.4 1-1/4 31.8 25.8 1-1/4 31.8 3.0 1-1/2 38.1 32.1 1-1/2 38.1 2 50.8 42.8 2 50.8 Taoyuan statioenry
