The Comfort-Flex® composite operator handles flex under load to help absorb vibration and schock. Increased safety in the event of contact with an underground utility line. Heat-treated spur gears are precision machine-cut, deliver unequated torque and horsepower. All-metal centrifugal clutch, oil-cooled to extend life, slips on overload or sudden contact with buried obstructions. Magura twist grip throttle control. Bits available in 2, 4, 6, 8, 10, and 12 inch bit.