DeWalt 7 pc. Premium Percussion Masonry Drill Bit SetPower through masonry, concrete, rock, and more with DEWALT Hammer Drill Bits. Featuring rock carbide tips that maximize surface contact for extended bit life and a 4 flute design that cleans debris while you work. 3 flats on the shank eliminate bit slippage. 2 cutter carbide tip of masonry drill bit set maximizes carbide surface contact for longer bit life. Four flute design cleans debris out for fast, efficient drilling Three flats on shank