50PCS Comb Binding Spine 16mmx3 Rings PP Multifunctional Book Binder Spine For
Good Compatibility: This binding comb has good compatibility for 9 holes B5 paper, 6 holes A5 paper, 6 holes A4 paper, 6 holes A6 paper, 6 holes A7 paper, and it is suitable for 10 holes, 20 holes, and 30 holes binding machines.