Staples you dream of. Perhaps the heavy-duty stapler in your office is covered in dust and cobwebs due to its rare use. You rarely need to staple dozens of documents every day. But for those exceptions when you need the heavy-duty stapler, you'll be glad to have it. You can also use it for lighter applications and lighter staples. The Leitz 5551 heavy-duty stapler features easily interchangeable cartridges. Each cartridge can also have a different staple size, such as the K6 cartridge. These staples have 6 mm legs, allowing you to punch through up to 25 sheets of standard 80 g/m² office paper at once. Each cartridge type has its own color; you can also see the corresponding indicators on the stapler. This makes it difficult to confuse the cartridges. Additionally, Leitz staples are very sturdy. Paper simply cannot bend them.