The MILWAUKEE® 4" root cutter cuts through roots inside the line. This drain pipe root cutter is best used in 4" - 6" pipes. The pipe root cutter has a steel construction and Rust Guard™ plating that provides longer-lasting head attachments. This head attachment works with Milwaukee 7/8" open wind sectional cable designed for the M18 FUEL™ sewer sectional machine with CABLE-DRIVE™.