Fellowes 44mm 5:1 pitch metal binding spirals in black (25 units) 5112101 ensure the impeccable binding of document blocks up to 410 A4 sheets. The box comes equipped with 25 black metal wire spirals, 44 mm in diameter, with a 5:1 pitch, offering smooth page turning. The black finish provides a sober look for large reports. Essential for documentation centers, engineering archives, and lawyers.