The 102mm (4") Root Cutter is designed to cut through roots inside the line. This drain pipe root cutter is best used in 102mm (4") to 152mm (6"). The steel construction gives the user longer-lasting head attachments. This head attachment works with 32mm (1-1/4") sectional cable and is designed for the MILWAUKEE® M18 FUEL™ Sectional Sewer Machine w/ ONE-KEY™.