Featuring front and rear blades, Spider begins cutting when cable is fed into line and continues to cut as when retracted. Double U-Cutter and Double Heavy Duty Side Cutter models are available in 3 and 4 in. sizes, and Double U-Cutter can be adapted for use on sectional drain cleaning machines as well as other brands of drain cleaners. Both cutters are available with connectors for drum-type or sectional drain cleaning machines.