The simple, ergonomic design makes it easy to handle and guarantees a high durability and a long service life - for easy made professional binding. Performance: Punching capacity of 4 sheets at a time or 1 front/rear cover. 21 punched holes per DIN-A4 page Binding: Spiral binding with a binding capacity of 50 sheets. For binding spines up to 12 mm diameter . Multiple use: For brochures, application folders, theses, menus, recipe books, reports, project folders, presentations, instructions, photo albums, calendars and much more. User-friendly: The classic binding system is easy to use. No more mispunching, thanks to intelligent paper guidance. Application field: For home use, in schools, offices, workshops and much more. Practical: Easy to remove and exchange individual pages at any time.