Abstract: An auger for boring holes through the surface of the earth. The auger is provided with a double flight which concurrently spirals about the hub of the auger, with the leading edges of the flights being arranged in opposition to one another.Digging teeth are mounted in spaced relationship within the leading edge of each flight, with the innermost tooth of each opposed flight being located 180.degree. apart, at different radii, and at different elevations respective to one another.Other teeth are spaced 180.degree. apart and located in each leading edge. The teeth are angularly displaced from the innermost teeth and arranged at different vertical elevations and different radii respective to one another.Additional teeth may be positioned on the leading edge of either flight. Adjacent teeth located in the leading edge of either flight are progressively spaced radially and vertically respective to one another.