NamiBind’s Multi-functional 4 IN 1 Combo document Binder Spiral Coil and Double Wiro Wire Binding Machine with spiral /wiro closer machine NB-2500. The Combo document Binder NB-2500 you can bind documents with both 4:1 pitch coil spiral and 2:1/3:1 pitch twin loop ring wire. The 4 in 1 document Binder NB-2500 is the only combination machine of its kind. The unique design of the NB-2500 includes the ability to paper punching machine both a 4:1 pitch round hole pattern for spiral coil binding and a 2:1/3:1 pitch Triangle hole pattern for twin loop wire ring binding up to 1-1/4″/7/16-1-1/4. Feature of binder NB-2500 Four to One pitch spiral coil (4 holes per inch) is the standard pitch of spiral coil used for binding presentations, proposals, and books. you would have to use two different types of document binding machine punching to do the same tasks as the NB-2500. You can choose between these great desktop document binding machine styles for all your reports and presentations and you can also save space, time, Labour, and money. this binder document punching smoothly which is hand operated.