It was convenient to put printouts and other papers in loose-leaf binders along with notes. This is a hole punch that can create loose-leaf paper. I no longer use it and it has been stored at home. The white and transparent parts of the punch are yellowed. Compatible Paper Sizes: A4 size: 30 holes B5 size: 26 holes A5 size: 22 holes Product Size: 39.4 x 13.21 x 2.79 cm