1 1/2" to 4" (30 mm to 110 mm) Drain LinesComplete unit includes: AUTOFEED® controls, solid core cable, 4-piece head set, and gloves. Corrosion-resistant cable drum includes 75-feet of ½-inch diameter cable. AUTOFEED® automatically advances and retrieves the cable at 10- to 14-feet per minute. Integrated Cable Control System causes the drum to stop spinning if the head becomes lodged in a blockage. Induction-style belt motor spins at 165RPMs. "Solid Core” Cable - uses tough 3?8" (10 mm) or 1?2" (12 mm) Integral Wound (IW) solid core cable that is rugged and kink resistant.AUTOFEED® Control - offered as an accessory, this patented, automatic cable feed powers cable in and out of the drain. Reverse the direction of the AUTOFEED and the cable feeds back into the drum.