Saddle stitch stapler
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Saddle Stitch staplers are a bookbinding tool designed to insert staples into the spine or saddle of folded matter such as booklets, catalogs, brochures, and manuals.
A few saddle stitch staplers such as the Ring King brand also use "loop-staples" that enable the user to integrate brochures etc. into ring books and binders.
Most high-end copier-multifunctionals and digital production printers on the market have optional attached saddle stitch units that fold and staple booklets automatically.