In any drive head, there is a tradeoff between torque (power) and speed (revolutions per minute). The high torque head provides a large amount of torque to the auger at a slower speed. The high torque translates into the Dingo's capability to dig 30" (76.2 cm) holes up to 6' (1.8 m) deep in clay, gravel, sandstone and many other conditions where lower torque heads get stuck.