3:1 pitch (8.46 mm), 34 holes, Punches up to 20 sheets at one time, Binds up to 120 sheets (4.5 mm -14.5 mm), All metal chassis and mechanism, With international standard hole scale, With wire ring binding controller, Punching performance : 7,500 Sheets Hour, Binding performance : 500 Books Hour, Adjustable paper size guide, Punching width Letter Size or A4 Size, Dimension : 425Lx 410W x 380 H mm