Comb Binding Machine Steel and aluminum main frame for durability Punches up to 15 sheets A4 80g Binds up to 450 sheets A4 80g with 51 mm of comb Binding mechanism is provided with 21 and 28 hooks to automatically engage Plastic binding rings Articulated punching bar Extractable arms from the base of the machine Adjustable edge guide Margin depth adjusts with 3 positions Waste drawer with see through window.