DEWALT DW5237 1/2-Inch by 18-Inch Drill Bit Premium Percussion</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>ROCK CARBIDE tip maximizes carbide surface contact for longer bit life.</li><li>Four flute design cleans debris out for fast， efficient drilling</li><li>Three flats on shank eliminate bit slipping in chuck (except DW5232， DW5233， DW5237， DW5238)</li><li>16-inches of usable length</li><li>18-inches overall length</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/31ZWUKbvdJL.jpg' noproxy></br>