Heavy Duty staple making machine: It is an extension of ordinary stapler. The staples of ordinary stapler are no more than 20 sheets of 10#, 12#, 14# binding paper. More than 20 sheets, it is difficult for the stapler to staple completely. And the binding paper of heavy-duty stapler is more than 100 sheets, which greatly exceeds that of ordinary stapler. Use 23/6, 23/13 for binding needles.