Erskine Attachments’ powerful Earth Auger drive units are durable enough to withstand any construction or utility use in even the toughest ground conditions. These planetary drive units produce high torque at low speeds and offer reverse rotation for cleaning of the hole. Choose from Hex or Round styles. Medium duty features include: fabricated boring head, fabricated boring head, hardened bolt-on gauge teeth (outside positions), hardened bolt-on wisdom teeth (inside positions); Hardened fishtail point; HD, double fighting; Available in 4″ lengths. Heavy duty features include: For difficult ground conditions, compacted soils, heavy clay, asphalt, frozen ground, fracturable rock; HD cast steel boring head; Hardened drive-in gauge teeth (outside position).