This auger is used for soils with a large gravel content. The auger body for stony soils consists of a heavy steel strip, vaulted all along, which is bent double by forging. The pointed cutting section of the strip is bent outward, thus creating a hole significantly wider than the average body diameter. The stony soil auger is used when the Riverside auger is not yielding adequate results in coarse gravel soils.
To achieve optimal results, the auger type should be chosen in respect of the soil type in question.