Topeakmart Binding Machine, Punch Machine Binder, Manual operation, Non-slip foot pads, 21 Hole, 450 Sheets Give any papers a professional-looking binding Binds up to 450 sheets of paper in a single book Binding capacity: 450 sheets(A4) Punching capacity: 12 sheets (A4 80g) Margin adjusts among 3,4,5mm