Electric Adjustable 1-21 Hole 400 Sheets Paper Comb Punch Binder Punching Binding Machine Scrapbook Office Punch up to 18 A4 sheets or bind up to 400 sheets, Foot pedal punch frees hands for binding 1-21 adjustable punch dies upon demand Advanced carbide cutting blades ensure accurate cutting power Adjustable punching depth for 3-stage paper margin