Although this bit will drill in any soil, this bit is specifically designed for clay. When drilling in clay, ordinary bits will have trouble because they will soon get covered in clay, and then slide around on top of the clay in the ground and cut very inefficiently.

This bit however cuts a narrow groove around the outside of the hole, too narrow to get bogged down. This leaves a "plug" of clay in the hole, which the inside blades of the bit can then break apart much more easily. If you expect a lot of clay while drilling your well, consider buying this bit; it can often drill two to three times faster through clay than other bits.

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