DEWALT DW5748 3/4-Inch by 17-Inch by 22-Inch 4-Cutter Spline Shank Rotary Hammer Bit</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>Open head design channels dust into flutes for quicker drilling</li><li>Longer helix four flute design expedites mill removal for quicker drilling.</li><li>Concave head design allows dust to enter flute chambers quickly increasing bit life</li><li>One year warranty， one year service contract， 30 day no-risk trial</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/31HEEycislL.jpg' noproxy></br>