Ridgid FlexShaft Drain Cleaning Machine Chain knocker expands to break up blockages and clean walls of the pipe. Can be operated with inspection camera in-line, letting you see while you clean (camera not included). Flexible cable spins inside a durable nylon sheath, resulting in less jobsite mess. Cordless drill (not included) attaches to center drive shaft to spin cable at high speeds. Increases user productivity with fast setup and cleanup, quick cleaning, and cordless convenience Pack of 1