Designed to punch and bind documents for high end users with demand for maximum punch and binding capacity, 21 individual & selectable punching pins, 5 position back margin & document measure, large front access waste tray, all metal engine and bodyElectric A4 heavy duty comb binder, up to 30 sheet punch capacity & up to 500 sheet binding capacity, fully adjustable edge guide (side margin), cooling fan, safety fuse and auto-reverse, pedal operating punching for up to 30 sheets in a single cycle