The 4" grease cutter clears grease clogs inside pipes. This grease cutter for drains is best used for 4" to 8" pipes. The steel construction and Rust Guard™ plating provides longer-lasting head attachments. This head attachment works with 1-1/4" open wind sectional cable designed for the MILWAUKEE® M18 FUEL™ sewer sectional machine with CABLE-DRIVE™.