In the printing industry, Saddle Stitching refers to a very popular book binding method in which folded sheets are gathered together one inside the other and then stapled through the fold line. The staples pass through the folded crease from the outside and are clinched between the centermost pages. Two staples are commonly used but larger books may require more staples along the spine. Saddle Stitching is used to bind multi-page booklets that are 4 pages or larger. For the saddle stitch method to work, the pages of your booklet need to be multiples of 4. Usually a booklet can be saddle stitched up to 50 pages (it can vary depending on the thickness of the paper).