Fellowes 5:1 pitch 38mm black metal binding spirals (25 units) 5111801 are suitable for large publications requiring maximum retention. The box of 25 units features a 38mm diameter, black coated metal binding with a 5:1 pitch, suitable for binding up to 350 A4 sheets in a single volume. Allows the document to be opened 360 degrees for easy consultation. Ideal for business archives, audit reports and historical records.