Tamerica 210PB Manual Comb Binding Machine, 20 Sheets Max. Punch Capacity, 425 Sheets Max. Bind Capacity, Adjustable Punch Depth Margin Control, Max. Punch Length 12" with Open Throat Punches 5,000 sheets/hr up to 12" or 21 holes Blinds 250 books/hr up to 2" thick Solid and durable metal construction 4-position punching depth adjustment 21 disengageable dies, Hollow ground dies