... hole sheet protector have 6,11,26,30 hole have A4,A3,B5,FC, Letter size can be used for file pocket ... . 11 hole sheet protector,office stationery,file pockethave 6, 11,26 ... , not easy to adhibit together.3.comfortable for reading and easy for documents' removableness4.suitable for important documents' safekeeping5.Provides attractive images,logo ...