The RIDGID C-21 5/16 in. x 50 ft. Hollow Core Drain Cleaning Cable is designed to be used with RIDGID K-40, K-45, and K-50 Sink Machines. Built for flexibility, the hollow core cable is rugged and kink resistant to provide more cleaning power to the cable end. RIDGID drain cable spins the auger head into clogs and blockage to break and remove them from pipes. Drain auger cable weighs 7 lbs. and is easy to install in RIDGID drain cleaners.