Fellowes 5:1 pitch 12mm silver metal binding spirals (100 units) 5115401 combine the durability of metal wire with a sophisticated look. With a 5:1 punch pitch and a 12mm diameter, this box of 100 units binds up to 95 A4 sheets cleanly and flexibly. The silver tone with metallic sheen highlights the quality of the document finish. Recommended for company presentations, design projects and reference manuals.