Fellowes 34mm 5:1 pitch metal binding spirals in black (50 units) 5111601 offer the capacity to bind large publications with maximum stability. The box contains 50 units with a 34mm diameter and 5:1 pitch in black metal wire, designed to bind up to 310 A4 sheets. Their wide diameter facilitates effortless document handling during perforation. Perfect for academic theses, complex budgets, and operational manuals.