The heavy-duty binder is great for storing archives, maintenance and operational manuals. Usually sold in sets, they are great for holding lots of content over several volumes. Or when you need multiple copies in multiple locations. The rigid post binder is expandable to accomodate more material and is available in two sizes: 2" - 4" or 3" - 5". The binder is made of double thick board and uses metal hinges for added durability. Label and identitfy your binders with foil stamping. Available in Blue, Black, Green or Red.