Fellowes 12mm 5:1 pitch metal binding spirals in black (100 units) 5110401 are the right choice for securely binding medium-thickness documents. This box includes 100 units of 12mm diameter black metal with a 5:1 pitch, with a capacity of 95 A4 sheets. The black coating prevents corrosion and offers an elegant aesthetic that rotates 360 degrees without jamming. Ideal for business files, minutes, and financial reports.