Our Inner Core Drum Cables are constructed of industrial steel spring. They carry power through the end of the cable for maximum clog crushing force. These general pipe cleaner cables are compatible with the MILWAUKEE® MX FUEL™ Sewer Drum Machine (MXF500 and MXF501), the MILWAUKEE® M18™ Drum Machine, and other professional drain cleaning machines. We back our drain cables with a 2-year warranty for defects or breakage.