Fellowes 22mm 5:1 pitch metal binding spirals in black (100 units) 5110901 are designed to bind considerable volumes while maintaining elegance. With a diameter of 22 mm and a 5:1 punch pitch, this pack of 100 black metal spirals securely holds up to 190 sheets of A4 paper. Its continuous structure does not deform under the weight of the paper and facilitates daily flipping. Ideal for legal compendiums, heavy training manuals, and archives.