The C340 and C450E make CombBind®/ZipBind® binding fast and easy! Bind up to 425 sheets of paper at a time for fast, customized bound documents. The sleek, compact design makes these models ideal creating presentations, training classes, manuals almost anywhere. The exclusive Paper Centering System aligns pages for perfect punching — up to 25 sheets per punch. Plus, the built-in Document Separator feature divides your stack of sheets into the right amount of pages for faster, more efficient punching. The C450 features convenient push button electronic punching.