Electric Auto Stapler Binder Book Binding Machine 2-50 sheet 110V 30w Thickness to be bound from 2 to 50 sheets (70g); Adjustable maximum even side depth of paper: 100mm; A single or multiple binders in series synchronous are workable; Easy change wearing papts-stapling plate and parts-slot plate. Fast and quiet, this manual stapler is not disruptive in any environment, low force stapling.