The RIDGID C-2IC (56787) 5/16 in. x 25 ft. Inner Cable with Drop Head Auger is ideal for cleaning 3/4" to 1 1/2" drain lines. The drop head auger easily leads into down drain pipes; it is particularly helpful for cleaning back-to-back mounted fixtures and severe bends. The cable has an inner core design that provides good flexibility while resisting kinking. It is suitable for use with the K-25 Hand Spinner, K-40 and K-45 Sink Machines, K-3800 Drum Machine, and K-50 Sectional Machine.