of inserts 20 and the second set of inserts 21 need not be 90 degrees and may vary without departing from the spirit of the inventions however in the preferred embodiment of this invention the first and second set of inserts 20 21 are rotated by at least 45 degrees in a transverse plane in the most preferred embodiment the inserts are rotated about 90 degrees in a transverse plane in the embodiment illustrated in fig2 the first set of inserts 20 are configured to resist both upward and downward axial forces inserts 20 a are inclined with respect to the tool axis and their faces oriented upward and radially outward such that they are most resistant to upward axial forces the faces of inserts 20 b are oriented downward such that they are most resistant to downward axial forces similarly the second set of inserts 21 is configured to resist both clockwise and counterclockwise torsional forces inserts 21 a are oriented such that they best resist clockwise rotational forces inserts 21 b are oriented such that they best resist counterclockwise torsional forces in the preferred embodiment the inserts are carbide discs however one skilled in the art will recognize that the inserts may be constructed from a variety of materials including tungsten carbide diamond or carbonized steel in the preferred embodiment the inserts may be constructed of any material that is harder than the material used in common casing so that the inserts can easily bite into the casing wall as is also shown in fig2 the inserts 20 are inserts that are generally cylindrical in shape while a preferred configuration for the inserts is shown it will be understood that any insert shape can be used one skilled in the art.