Saddle stitch stapler

Saddle stitch staplers or simply saddle staplers are bookbinding tools designed to insert staples into the spine (saddle) of folded printed matter such as booklets, catalogues, brochures, and manuals. They are distinguished by their unusual length (most traditional staplers are too short to staple booklets easily) and by the presence of a V-shaped hump or "saddle" which is used to precisely align the central fold of the material to be stapled.