Bosch HC4511 1/2-Inch x 8-Inch x 13-Inch Spline Rotary Hammer Bit<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Carbide tipped bit head is harder， tougher， and more resistant to extreme loads</li><li>1/2-Inch diameter， 8-Inch useable length， 13-Inch overall length</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31EEP1GVHBL.jpg" noproxy>