Lever arch file with the patented esselte no 1 mechanism which guarantees prongs will close reliably even after 10 000 uses and when the file is full 75 mm spine to hold up to 500 a4 sheets of paper cover lock thumbhole and protected metal edges for easy handling and secure document storage made from strong board covered with wipe clean polypropylene and replaceable spine label for easier personalisation 3 year guarantee on the mechanism and the material is fsc certified