The Medium Opening Tool is designed to penetrate clogs and get water flowing. This drain pipe root cutter is best used in 102mm (4") to 203mm (8") pipes. 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™.