DEWALT DT90238 Extreme Tri-Flute Spade Bit Set, 6 PieceDEWALT Extreme Tri Flute Spade Bits with 3 cutting edges for up to 6x faster cutting, combined with a tri flute for optimum chip removal and less binding. There are 3 cutting spurs for cleaner and faster holes, the spurs also extend drilling life. Its full screw tip allows the bit to self feed, for ease of use and pull through. Fitted with a quick change shank, fits standard quick change extensions and 1 4in hex bit adaptors. For use with corded and