Fellowes 46mm 5:1 pitch metal binding spirals in black (25 units) 5112201 offer maximum capacity for massive volumes of A4 paper. Each box contains 25 46mm black coated metal spirals with a 5:1 pitch, designed to bind up to 430 sheets in a single document. The smooth rotation and high material strength ensure excellent durability. Suitable for complete user manuals, construction files and internal encyclopedias.