Fellowes 5:1 pitch 10mm black metal binding spirals (100 units) 5110301 offer a classic and secure solution for binding sheets of paper. Made of black coated metal with a 5:1 pitch, these 10mm diameter spirals can hold up to 75 sheets of A4 paper. The black finish ensures a sober look, allowing the document to be fully opened on a table. Perfect for business reports, manuals and work files.