A heavy-duty stapler is usually bigger than the standard types. It has a more extended handle and base and can accommodate the width of the sheets. However, the different features it has are the power of the piercing tip and the size of the staple pin. Even if a stapler has strong jaws to penetrate papers, the staple inside must be long enough to join all the sheets. The heavy-duty stapler has both long staples and strong piercing strength.