Wobble Auger produces a hole with no loose dirt in the bottom or around the top of the hole as the dirt becomes compacted on all sides. The tool penetrates dirt, clay, sand, asphalt, and compacted or embedded rock. It comes in 4-, 6-, and 9-inch diameters, with standard 4-foot length. The company recommends its 9-inch Wobble Auger be used on a skid steer with a rated operating capacity of 2,250 pounds or greater utilizing an auger drive with 2,000 ft.-lb. of torque or greater. Various collar options are available.