for thickness of 2-170 pieces of paper with one needle,cutting the switch atomatically. Hand-overlord type of DS-AHeavyweight multipurpose binding ... they are, for thickness of 2-170 pieces of paper with one staple .It is saving the time to change the ... staple frequently2,Files bind easily.3,Swith automation recovery,convinent with files saves.4,Lending to the tidal current,improve the ...