Fellowes 24mm 5:1 pitch metal binding spirals in silver (100 units) 5116001 offer enormous binding capacity with an elegant silver finish. Each box contains 100 units of 24mm diameter with a 5:1 pitch in durable silver metal, capable of binding up to 210 A4 sheets into a single volume. The silver metal finish adds sophistication to bulky publications. Recommended for large annual reports and engineering manuals.