high-quality single-flute auger with specially ground roof tip and very stable spiral design, high-quality coating for minimal friction, for tear-free drilling of all softwoods on prefabrication machines, very good fit of dowels due to negative tolerance of the drill diameter, particularly suitable for drilling planed or finished laminated beams due to the special head geometry, entry and exit of the hole significantly less prone to tearing than conventional augers, suitable only for use on prefabrication machines, no manual operation possible